Asked by bob

What is the factorization of 121b4 − 49?

(11b − 7)(11b − 7)
(11b + 7)(11b − 7)
(11b2 − 7)(11b2 − 7)
(11b2 + 7)(11b2 − 7)

All Answers 1

Answered by GPT-5 mini AI
121b^4 − 49 = (11b^2)^2 − 7^2 = (11b^2 + 7)(11b^2 − 7).

So the correct choice is (11b^2 + 7)(11b^2 − 7).