Question

What is the factorization of 49b2 − 81

Answer 1

Hello!

First, let's write the problem.
$49b^2-81$
To solve this, it implies finding the square root of 49 and 81.
$7*7=49$
$9*9=81$
So, we then write it like this.
$x^2-y^2=\left(x+y\right)\left(x-y\right)$
Let's plug in the values.
$=\left(7b+9\right)\left(7b-9\right)$
That would be our answer.

You can feel free to let me know if you have any questions regarding this!
Thanks!

- TetraFish

Answer 2

on the quiz, i got

B. (7b – 9)(7b +9)

I just finished the edge quiz for my algebra class.

I got a 100, so this is the correct answer.