why minus multiplied by minus is plus?
607147
The natural numbers are the counting numbers, 1, 2, 3, ...\nMultiplication is defined there as repeated addition. That is, 3 x 4 = 3 + 3 + 3 + 3.\n\nNegative numbers are invented by mathematicians so they can solve problems that you can write using the natural numbers but don't have a solution in the natural numbers like\nx + 5 = 4.\n\nWhen you extend the definition of multiplication to cover the negative numbers, the only way to do it and have it remain consistent with the rest of arithmetic is for the product of two negative numbers to be positive.\n\nIn brief, it's the only way to do it without breaking the rest of your arithmetic.
462143
When you add a positive number and a negative number, you actually subtract the two numbers, then choose the sign of the larger number for your answer.\n\nWhen you subtract a negative number from a positive number, the negative number becomes positive and you add the 2 numbers.\n\nWhen you subtract a positive number from a negative number, it becomes negative and you add the 2 numbers.
895708
Order of operations: Parentheses Exponent Multiplication Division Addition Subtraction.\n\n2 - 2[4-9] ÷ (-5)\n2 - 2[-5] ÷ (-5)\n2 - [-10] ÷ (-5)  ~~ same as 2 + 10 ÷ (-5)\n2 + [-2]  ~~ same as 2 -2\n= 0\n\nI'd double check that if I were you; it's a bit early for me. :*)
887284
Subtracting, and adding a negative #, are the same thing. So this equation can also be expressed as:\n(-5x + 6) - (-2x + -7)\nThe negative after the last part of the function, effectively reverses the negatives inside the parenthesis:\n(-5x +6) + (2x + 7)\nFrom there, since this is just addition and subtraction, you can just remove the parenthesis:\n-5x + 6 +2x + 7\nCombine like terms and you've got:\n13 - 3x
653428
Because -2 squared = (-2)(-2)\n\nA negative times a negative equals a positive.
562003
a minus sign with a dot above it and a dot below it.\n\nMENTALLY SUPERIMPOSE THESE TWO CHARACTERS \n:-
965967
The twos being subscripts simply means you are using binary notation. In binary computation it is only necessary (for addition) to remember that 0 + 0 = 0,------0 + 1 = 1---------and 1 + 1= 10.\n\n                                    10011\n                                  +  1110\n                                  ________\n\n                                   100001\n\n\nIn the right column, 1 + 0 = 1\nIn the next column1 + 1 = 10. Put the zero down, carry the 1\nIn the next column1 + 1 = 10. Put the zero down, carry the 1\nIn the next column 1 + 1 = 10Put the zero down carry the one\nIn the next column 1 + 1 = 10Put down the 10
1082141
divide. multiply. subtract. bring down
984884
Adding and subtracting:  You use the sign from the largest number.\n\nIn your example: 8x +6x + 2 + 10\nAll are positive.  You have 14x + 12\n\nLet's say you  have 8x - 6x.  the 8 is bigger and is positive so your answer is positive.  It's 2x.\n\nNow try 6x - 8x.  The 8x is negative and is the larger number.  So it is going to be negative.  The answer is - 2x.  \n\nIf multiplaying or dividing:\n\n+ and + is +\n+ and  - is -\n-  and -  is + \n\nYou must have to memorize those.  Remember, it's always positive unless one sign is positive and one negative.  Then it is negative.\n\nBest Wishes,\nSue
218778
The answer is -1\n\nIn Algebra, anytime you subtract a number, you change the number following the minus sign into its inverse (negative to a posotive and positive to a negative) and then add.  Therefore, your problem becomes -12+11, giving an answer of -1.
294368
4-4\nI don't know if - means minus or not.
277740
Ok, well you just asked why it equals 1 instead of 1, did you mean why doesn't it = 0?\n\nHere's why:\n\nThe basic rules of exponents when the bases are the same is that in multiplication, you add the exponents and in division, you subtract them.  So think of (x^n)/(x^n).  You would subtract n - n = 0, leaving x^0.  Also, with (x^n)/(x^n), anything divided by itself is one, so x^0 is 1.
913544
In school they used to teach us to read the words...\n\nIf the words said "minus a minus"\n. . . that meant plus\n\nSo your example 9X- (-2x)\n\nis 9X minus a minus 2x\n\nWhich means\n\n9X plus 2X\n\nWhich is 11X\n\nGood luck,\nZah
302002
Basic subtraction. Ok, you are taking stuff away from what you have, so...\n\n(-3)-3 you have -3 take away three, counting down that is -6. Or you can think of it as the two -s forming a +. \n\n Ok if you have the problem...(-5)-(+3)= change the subtraction sign to + and the 3 to the oppisite in this case -3\n\nExaples\n1. (-8)-+3=   -8+-3 now it is a adding problem = -11
680703
Integers are all of the natural numbers.Are you asking about negative and positive integers and why are the signs changed at times?\nIf that is the case,you cannot subtract a negative from a negative because you get a positve.It is counter-intuitve but if you think about it,it makes sense.\nFor instance a -6--6=what?It all depends upon where the signs are placed and if it a parenthetical(if it has parentheses) expression.\nDo you see how that problem can have a number of solutions,depending upon how it is expressed(set up)?\nThe answer is concievably a -12 or it can be zero.\nYou must first understand that the answer may not be evident.\nThere is no easier way to deal with it.You must understand it in your mind:it is strictly an intellect thing.\nIt really is a mind game in ways,but it is a good one.You can do it,it's fun in ways.It teaches you to think and to widen the mind.\nThere is a method to the madness however and once you get that straightend out in your mind,you will feel like a genius.\nIt always works the same and it never works differently:all you have to do is look for the sense of it and ask questions.\nIn the example that I gave,a negative six subtracted from a negative six is a negtive 12.However a double like sign with a negative number cancels itself out and becomes positive.The answer is zero,because there are no parentheses.
624572
Your question does not make sense, but the multiplication sign and the addition sign are not always interchangable. Life is not fair, life is  B!TC#
128537
It's arbitrary.\n\nWe are used to "x" and "y" (and perhaps "z") being used as the variables, but we also need to have a representation of constants. Using a specific number would make it seem as though only that number works in the equation.