Question

3)
Factor Completely: x2 - 81
A)
(x - 9)(x + 9)
B)
(x + 9)(x + 9)
C)
(x - 9)(x - 9)
D)
(9 - x)(9 + x)

Answer 1

Diffrence of 2 squares
\[\huge~\rm~\sqrt{x^2}-\sqrt{81}\]
Write it in this form:
\[\huge~\rm~ (a+b) (a-b)\]

Answer 2

?

Answer 3

Whats the square root of 81?

Answer 4

9

Answer 5

Ok so then you would write the phrase
(x+9) (x-9)

Answer 6

ok thx