Question

Factor completely 49x2 - 81.

(7x + 9)2

(7x - 9)2

(7x + 9)(7x - 9)

7x - 9

Answer 1

do you know what the square root of -81 is?

Answer 2

or rather just the square root of 81

Answer 3

9

Answer 4

good now what signs do you need to multiply to get to -81?
++
--
+-

Answer 5

+-

Answer 6

yep. now what is the square root of 49?

Answer 7

7

Answer 8

yep and the square root of a^2?

Answer 9

sorry x^2

Answer 10

:/ mm idk

Answer 11

that is x*x so the square root of that is just x

Answer 12

so you have (7x + 9)(7x-9)

Answer 13

so c

Answer 14

yep