SOLUTION: Solve the equation by factoring: 4x^2+15x=25
What I did: 4x^2+15x-25=0
(x+20)(x-5)=0
x+20=0 x-5=0
x+-20 x=5
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Question 46986This question is from textbook Elementary and Intermediate Algebra: A Combined Course
: Solve the equation by factoring: 4x^2+15x=25
What I did: 4x^2+15x-25=0
(x+20)(x-5)=0
x+20=0 x-5=0
x+-20 x=5
This question is from textbook Elementary and Intermediate Algebra: A Combined Course
Answer by Cintchr(481) (Show Source): You can put this solution on YOUR website!
You brought the 25 back onto the side with the other parts, but when factoring, 20 * 5 is not 25 ... you looked for what added to 25 .. not what multiplied to get 25.
F: 4x * x = 4x^2
O: 4x * 5 = 20x
I: -5 * x = -5x
L: -5 * 5 = -25
and
add five and subtract five
and
and
Divide by four on the first part
and
x = {-5, 5/4}
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