# Factoring help?

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• September 14th 2009, 07:10 PM
malcomfred
Factoring help?
I have trouble with these two questions.

Factor

1) 5r^2-11rs+2s^2

2) 5x^3-4x^2-5x+4

Please explain in detail. Thanks
• September 14th 2009, 07:17 PM
VonNemo19
Quote:

Originally Posted by malcomfred
I have trouble with these two questions.

Factor

1) 5r^2-11rs+2s^2

2) 5x^3-4x^2-5x+4

Please explain in detail. Thanks

1. Hint: This is fairly straighforward because the signs must both be negative and 5 and 2 are both prime numbers.

2. Hint: group the terms like this $(5x^3-5x)-(4x^2-4)$