Factoring 4x^2 - 25y^2

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ugh...math

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Can you please explain how to get the answer to the following problem:

Factor: 4x^2 - 25y^2

I thought this problem was unfactorable, but was wrong.

Thank you!
 
Re: Factoring

ugh...math said:
Can you please explain how to get the answer to the following problem:

Factor: 4x^2 - 25y^2

I thought this problem was unfactorable, but was wrong.
Click to expand...
Any expression of the form x^2 - y^2 can be immediately factored into (x + y)(x - y)

Therefore, you have (2x + 5y)(2x - 5y).
 
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