math
posted by Natalie .
Use the “difference of squares” rule to factor the following expression
494y^2
my answer is going to be (72y)(72y)
I wasn't sure if it could of been (72y)(7+2y)

Your answer should be (72y)(7+2y).
If you multiply the first equation (72y)(72y) it would equal 4914y14y+4y^2. After simplifying it would equal 4928y+4y^2. The second option multiplies out to 49+14y14y4y^2. The 14y's cancel each other. That leaves 494y^2. Hope that helps. 
Thank You So Much Sam! :)