Question

Solve 4r2 – 9 = 91.

A.
{± 3}

B.
{± 4}

C.
{± 5}

D.
{±6}

Answer 1

i think its c

Answer 2

r=5 or r=−5
this might help it also show the steps on how to figure it out just type or past the question:
http://www.mathpapa.com/algebra-calculator.html

Answer 3

so C?

Answer 4

@EveTheAwsome

Answer 5

Yes