Question

Solve a^2 - 81 = 0 by factoring. Select all possible answers.


-9


0


9


No solution


Infinite solutions

Answer 1

A and C xD

Answer 2

use

a^2-b^2=(a+b)(a-b)

Answer 3

9 is the correct answer as u know 81 is the square of 9 so when u takeout the square root of 81 it will equal to 9

Answer 4

Itsa Perfect square, you will have (a+9)(a-9). Then set each equal to zero.

Answer 5

(a+9)(a-9)=0

Answer 6

you will get

a^2-9^2=(a+9)(a-9)

so a=9,-9

Answer 7

a=9 or a=-9

Answer 8

So A and C.

Answer 9

Thank you.