Question

What is the factored form of the expression? t2 – 81

A. (t + 9)(t – 9)
B. (t + 81)(t – 1)
C. (t + 9)2
D. (t – 9)2

Answer 1

a

Explanation:

A. (t + 9)(t – 9)

bc bro im taking the same test

Answer 2

we have that
t² – 81

we know that
A difference of two perfect squares, (A² - B²) can be factored into (A+B) • (A-B)
let
A²-------> t²
B²-------> 9²
then
(t² – 9²)------->(t+9)*(t-9)

the answer is
(t+9)*(t-9)