Replace R2 by R1 + (-1)R2\n1 -3    4\n2  3    1\n\nChoices are\nA.1 -1  2\n  1 4  -1\n\nB. 1 -1  2\n   3  2  3\n\nC.  1 -3  4\n   -1 -6  3\n\nD. 1 -1  2\n   2  3  1
212831
The system of equations:\n[a11 a12 a13; a21 a22 a23]\n[1 -3 4; 2 3 1]\n\nPerforming indicated row operation:\n[a11 a12 a13; a21' a22' a23']\n[1 -3 4; -1 -6 3]\n\na21' = a11 - a21 = 1 - 2 = -1\na22' = a12 - a22 = -3 - 3 = -6\na23' = a13 - a23 = 4 - 1 = 3
470893
1.  (x + 9)(x - 9)\n2.  (t + 2)(t - 2)\n3.  (b + 12)(b - 12)
525712
[12(X+21]/ -1 to [-12(X+11]
539485
Not sure why u can't do these yourself but 1) = -360 \n2) -12\n3)-56.8\n4)-45\n5)1328\n6)-144\n7)-.5\n8)25\n9)11\n Those should be right
435671
OK,as the first one is already done,I am doing the rest for you\n4(2x-6)=x+2 =>8x-24=x+2  =>8x-x=2+24  =>7x=26  =>x=26/3=8 2/3  (3) 2(x+5)+1=3(x-1)+4   =>2x+10+1=3x-3+4 =>2x-3x=-3+4-10-1  => -x=-4  =>x=1  (5)x+6=4(4x-1)   =>x+6=16x-4  =>x-16x=-4-6  => -15x=-10  =>x=-10/-15=2/3 [after reducing]
634440
if ur just solving that equation...u dont need to switch the sign.....\nwatch (im not gonna have the equal sign on the bottom takes too long). \n\nx-1<-3\n(add one to both sides now)\nx<-2\n\nthers ur answer
162737
any number N1 can be converted to N2 BY\naddtion:\n  N1 + N2 + (-N2 ) \ndivision:\n 1/[(N1/N2)/N1]\nMULTIPLICATION\n N1 * N2 * N1^-1\nSUBTRACTION\n[N1-(N1-N2]
471603
Using matices to do this\n\n[ 1 -2 1] * [x] = [-5]\n[ 2 -1 1]   [y]    [ 1]\n[2  1  2]   [z]    [10]\n\nAX = B\nA*A^(-1)X = A^(-1)B\nX = A^(-1)B\n\nSO we need the inverse of A this can be worked out using a long and tedious method or just use a calculator\n\nA^-1 = [ -.6 1 -.2]\n           [ -.4 0   2]   \n           [.8   -1 .6]\n\nA^-1B = [2}\n              [4}\n              [1]\nso x =2  y=4 z=1\n\n now you do the other one\nCheck\n2 - (4*2) +1 = 2 - 8 +1 = -5
498452
a.x=[-8+/-rt(64-24)]/2\n\nb.x=[-5+/-rt(25-56)]/4\n\nc.x=[-7+/-rt(49-64)]/4\n\nd.x=[-5+/-rt(25-72)]/4
494955
(A) 3+2(x-1)\n\n3+2x+2\n2x+5\n\n(B) 5-2(x+3)\n\n5-2x-6\n-2x-1\n\n(C) 1+2(x-1)\n\n1+2x-2\n2x-1\n\n(D) 6-3(w-2)\n\n6-3w+6\n-3w+12
390010
x(abs[x- (x^2)] (-1=2)\n\n:> peace\n.
140648
5/X+1<-2\n-1\n5/X<-3\n*X\n5<-3X\n/-3\n-5/3<X
289429
Another Method.\n\n-1 = -1\n\n-1/1 = 1/-1\n\nSquare root both sides,\n\nSQR(-1/1) = SQR (1/-1)\n\nExpanding,\n\nSQR(-1)/SQR(1) = SQR(1)/SQR(-1)\n\nSQR(-1)/1 = 1/SQR(-1)\n\nCross Multiply,\n\nSQR(-1)*SQR(-1) = 1\n\n(SQR(-1))^2 = 1\n\n-1 = 1\n\nDivide by 2 on both sides,\n\n-1/2 = 1/2\n\nAdd 3/2 to both sides,\n\n-1/2 + 3/2 = 1/2 + 3/2\n\n1 = 2 (ans)
539801
1) 2a + 3b = -1\n2) 3a + 5b = -2\n\nTo get to where we can add the equations, multiply equation 1 by 3 and equation 2 by -2\n\n1a) 6a + 9b = -3\n2a)-6a -10b = 4\n----------------------\n. . . . . . -1b = 1\nb = - 1\n\nPut into equation 1\n\n2a + 3(-1) = - 1\n2a - 3 = - 1\n2a = 2\na = 1\n\nCheck in equation 2\n\n3(1) + 5(-1) = - 2\n3 - 5 = - 2\n- 2 = - 2
511928
8x-10x > -11-1\n\n-2x > -12\n\nx < 6
544230
1. 1s2 2s2 2p6 3s1\n2. 1s2 2s2 2p6 \n3. 1s2 2s2 2p4\n4. 1s2 2s2 2p6\n5. 1s2 2s2 2p6 3s2 3p6 3d7 4s2
473865
#1\n\nt=0 or -3\n\n#2\n\np^2 - (1/4)^2 which is p^2 - 1/16