Asked by Tim

Can someone tell me if I am right?

Factor by group

20x^2-12x=15x-9
20x^2+3x+9
(4x+3)(5x-3) answer
Answered by Chaz
20x^2-27x-9
Answered by Chaz
meant +9 and then do the rest.
Answered by Reiny
yes, you are right, but you should have maintained your equation.
20x^2+3x+9 = 0
(4x+3)(5x-3) = 0

You could have tested your answer by expanding it to get back the
20x^2+3x+9 = 0
Answered by Reiny
oops, just looked at your second line and assumed you would have had that one correct,
Chad is correct above.
Answered by Tim
So my second line should be:

20x^2-27x+9=0
Answered by Reiny
yes, and it factors to
(5x-3)(4x-3) = 0

test the answer by expanding it
Answered by Tim
Sorry, I put and = when it should have been a +! Is the one below right?


20x^2-12x+15x-9

20x^2-12x+15x-9

= 20x^2+3x-9
= (4x+3)(5x-3)
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