how do you solve: 25x^2 - 81x = 0?
148117
25x^2 - 81x = 0\nx(25x - 81) = 0\nx = 0\n25x - 81 = 0\n25x = 81\nx = 81 / 25\n\nSo, x = 0 or x = 81/25.
674167
Solve this by using logarithms\nlog((1/5)^2x) = log(625)\n2x*log(1/5) = log(625)  Product Rule\n2x = log(625)/log(1/5)\n2x = -4\nx = -2\n\ntosmith
877752
Forty.\nCross multiply/divide  \n5/8=25/x\nmultiply both sides by x and both sides by 8\nyou get\n5x=25 times 8\n\nx = (25x8)/5  or x=25/5 x 8 or x = 5 x 8
797702
Since there is no = sign in that equation, I assumne it should be equal to zero.  If that is the case then m= -1/8
59552
we have \nx^2 -84x+1764=0\nit's equation of second degree\nsolution x=42
542416
5x^2-2x-3 = 0\n\nX= (-b(+or-) sqrt B^2-4ac)/2c\n\nX= -(-2)+ (sqrt4-4*5*-3)/-6 or,\n\nX= (-(-2) - (sqrt4-4*5*-3))/-6\n\nX=  (2+ 8)/-6,\n\nX= -5/3\n\nOr\n\nX = 2-8/(-6) = 1
958531
2x+80-x=120\nx=40 double \n80-x=40 single.
855361
2x^2 - 9x - 5=0\n(2x+1)(x-5)=0\n2x+1=0\nx=-1/2\nx-5=0\nx=5\n\nroots are \nx=5, -1/2
983225
remember the rule nx^n-1\n2x^2-1\n \nSo in this case it is 2x
712870
You only can say\nRoot[x^2 - 25x + 40]\nType for x sq only x^2.\n\nTh
346405
You have to solve the equation so that you can eliminate the sqrt by raising it to the second power .for instance,\n\nsqrt(2x+10)=5     you square it and get\n\n2x+10=25   easy, isnt it?\n\nbe careful if you have something like this\n\nsqrt(x+3)+sqrt(x-2)= 5\n\nhere you cannot do that you have to distribute one sqrt on each side of the equation.\n\nsqrt(x+3)=5-sqrt(x-2)\n\nnow you can square them
339198
2x0 = 0\nIt'll be the same as today... :P
555213
x^2 - 20 = 0\nx^2 = 20\nx = ±sqrt(20)\nx = ±sqrt(4 * 5)\nx = ±2sqrt(5)
238029
write in standard form, factor, set factors to zero.\n\nx^2-5x-50=0\n(x-10)(x+5)=0\nx-10=0, x=10\nx+5=0, x=-5
921698
let the base be x\narea=1/2*x*[5^2-(x/2)^2]\n       =1/2x[25-x^2/4]\ndA/dx=1/2[x(-1/2x)+(25-x^2/4)]\nsetting it to zero\n1/4x^2=-x^2/4+25\nx^2/2=25\nx^2=50/3\nx=5rt(2/3)\nh=rt(25-50/12)\n=rt250/12\n=5/2rt(10/3)\narea=(1/2)5rt(2/3)(5/2)rt(10/3)\n=25/4rt(20/9)\n=25/12rt20\nx=10/rt3\narea=1/2*10/rt3*200/12
193745
1.25 * 10^-3 * 8 * 10^-5\n\n(1.25 * 8) * (10^-3 * 10^-5)\n\n(10^1) * (10^-8)\n\nANSWER : 1.0 * 10^-7
45380
its simple ... 80*70*60 ... 10*0 = 0 !!\n\nright isnt it ??? :D