Question

Expand the polynomial and simplify:
(y–9)^2

Answer 1

= y^2 -18y +81

Explanation:

(y–9)^2

(y-9) (y-9)

FOIL

first: y*y = y^2

outer: -9y

inner: -9y

last: -9*-9 = 81

Add them all together = y^2 -9y-9y+81

= y^2 -18y +81