SOLUTION: What am I doing wrong?
-5x-2[2x-4(x+7)]-6
Here is my work down.
-5x-2[2x-4(x+7)]-6
-5x-2[2x-4x+28]-6
-5x-4x-8x+56-6
-17x+50. I know that answer is wrong. But, why
Algebra.Com
Question 450333: What am I doing wrong?
-5x-2[2x-4(x+7)]-6
Here is my work down.
-5x-2[2x-4(x+7)]-6
-5x-2[2x-4x+28]-6
-5x-4x-8x+56-6
-17x+50. I know that answer is wrong. But, why is the -8x not needed? Don't you distribute?
Thanks
Found 3 solutions by rwm, scott8148, MathLover1:
Answer by rwm(914) (Show Source): You can put this solution on YOUR website!
-5x-2[2x-4(x+7)]-6
-5x-2[2x-4x+28]-6
made a mistake here
-28 not plus
-5x-2[2x-4x-28]-6
-5x-2[-2x-28]-6
-5x+4x+56-6
-1x+50
50-1x
simplified it is
50-x
-5x-2[2x-4x+28]-6
-5x-4x-8x+56-6
as for the 8x you made a mistake there too.
I added the 2x and the -4x to get -2x which gets multiplied by -2 and becomes +4x
let's say we did it your way.
-2*2x=-4x
-2*-4x=+8x
-4x+8x=4x
Answer by scott8148(6628) (Show Source): You can put this solution on YOUR website!
yes, but you are not distributing the signs correctly
-5x-2[2x-4(x+7)]-6
-5x-2[2x-4x-28]-6
-5x-4x+8x+56-6
-x + 50
Answer by MathLover1(20849) (Show Source): You can put this solution on YOUR website!
....here was your mistake..it should be because
you multiplying by
.....same as above...be careful with signs
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