Question

Help Medal and Fan
If (9x − 4)(9x + 4) = ax2 − b, what is the value of a?

The value of a is _____________.

Answer 1

@DanJS

Answer 2

81x^2 + 36x-36x-16

Answer 3

81x^2-16

Answer 4

so it cancels out

Answer 5

wouldnt it be 81? since 81 is the term for a

Answer 6

i mean 81

Answer 7

lol thanks again

Answer 8

lol thanks again

Answer 9

already done
difference of 2 squares
yes a = 81