Question

how do you factor y^2-81

Answer 1

Do you recognize the pattern:

\(a^2 - b^2 = (a + b)(a - b) \) ?

Answer 2

yeah

Answer 3

This is called factoring "a difference of trwo squares."

Answer 4

\( y^2 - 81\)

\( = y^2 - 9^2\)

Now follow the pattern. What do you get?

Answer 5

y^2-72y-81<-is the answer

Answer 6

(y+9) (y-9) is the factor?

Answer 7

The second one.

Answer 8

okay thanks!

Answer 9

wlcm