Question

Can someone please solve this and show work?

Directions - Factor completely.

-28y^2 + 7t^2

Answer 1

Rewrite it as:
\[7t^2-28y^2=7(t^2-4y^2)=7(t+2y)(t-2y)\]
Because:
\[(a^2-b^2)=(a-b)(a+b)\]
Called a difference of squares.