SOLUTION: Factor the following expressions completely: a. x^3-4x=0 b. 2x^2+7x-15=0

Algebra ->  Equations -> SOLUTION: Factor the following expressions completely: a. x^3-4x=0 b. 2x^2+7x-15=0       Log On


   

Question 148473: Factor the following expressions completely:
a. x^3-4x=0
b. 2x^2+7x-15=0

Answer by mangopeeler07(462) About Me  (Show Source):
You can put this solution on YOUR website!
a. x%5E3-4x=0

First factor out x. Then you get

x%28x%5E2-4%29=0

Don't stop there!

Then factor x%5E2-4 and get

x%28x-2%29%28x%2B2%29=0

OK now you can stop.

b. 2x%5E2%2B7x-15=0

Factor the expression

%282x-3%29%28x%2B5%29=0

You're done.