Question

Determine which polynomial is a difference of two squares.

A. y^2 − 25
B. y^2 + 25
C. y^2 − 10
D. y^2 + 10

Answer 1

y^2 − 25 = (y-5)(y+5)

Answer 2

so A

Answer 3

Yes, A. That factors to (y-5)(y+5). That is a difference of two squares.

Answer 4

Actually the question is wrong, technically all of them work over real and non reals, and both A and C works for reals..

Answer 5

*work, not works