Question

Which of the equations are true identities?

A. (5b- 2)^2+ 4 = 25b^2– 20b
B. (2x² + y^2)(2x² - y2) = 4x^2– y
Choose 1 answer:

Answer 1

None of them are correct

Explanation:

Got answer wrong

Answer 2

A

Explanation:

I assume that you mean -4 instead of +4 in the first one

`(5b-2)^2-4=25b^2-20b+4-4=25b^2-20b`

then A is the correct answer