Question

Express (x+9)^2 as a trinomial in standard form.

Answer 1

x^2 + 18x + 81

Explanation:

(x+9) (x+9)

then distributive property

Answer 2

`(x+9)^2\\\\=x^2 + 2\cdot 9 \cdot x + 9^2\\\\=x^2 +18x+81`