Posted by **Natalie** on Monday, July 25, 2011 at 3:55pm.

Use the “difference of squares” rule to factor the following expression

49-4y^2

my answer is going to be (7-2y)(7-2y)

I wasnt sure if it could of been (7-2y)(7+2y)

- math -
**Sam**, Monday, July 25, 2011 at 4:20pm
Your answer should be (7-2y)(7+2y).

If you multiply the first equation (7-2y)(7-2y) it would equal 49-14y-14y+4y^2. After simplifying it would equal 49-28y+4y^2. The second option multiplies out to 49+14y-14y-4y^2. The 14y's cancel each other. That leaves 49-4y^2. Hope that helps.

- math -
**Natalie**, Monday, July 25, 2011 at 11:30pm
Thank You So Much Sam! :)

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