Question

(y-9)^3

Answer 1

\[(y-9)^3=(y-9)(y-9)(y-9)\]

Does that help?

Answer 2

yes

Answer 3

\[(a - b)^3 = a^3 - b^3 - 3ab(a - b)\]

Here : a = y
and b = 9..

Substitute the values and use the formula written above..

Answer 4

y^3+3y^2*9-3y*9*9+9^3