Turn into a trinomial {(9x + 1)}^(2)

Question

Turn into a trinomial

`{(9x + 1)}^(2)`

Answer 1

(9x+1)^2

(9x+1) (9x+1)

FOIL

First 9x*9x = 81x^2

outer: 9x*1 =9x

inner 1*9x = 9x

last 1*1 =1

add them together

81x^2 +9x+9x+1

combine like terms

81x^2+18x +1