Anonymous
Anonymous asked in Science & MathematicsMathematics · 1 decade ago

What is (a-b)^2-16(a+2b)^2 fully factored?

I have a math test 2morrow, and I want 2 make sure I know everything.

Update:

An explanation would be nice. PLEEZ

Update 2:

10 points for the first answer.

1 Answer

Relevance
  • 1 decade ago
    Favorite Answer

    What you've got is the difference of squares, where 16(a+2b)^2 = [4(a+2b)]^2

    So

    (a-b)^2-16(a+2b)^2 =

    [(a-b) + 4(a+2b)] [(a-b) - 4(a+2b)]

    The factoring is finished here, but it would be nice to simplify:

    (-3)(5a + 7b) (a + 3b)

Still have questions? Get your answers by asking now.