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

the value of a is

value of a is, 81

Step-by-step explanation:

Using the identity rule:

Given the equation:

Apply the identity rule:

⇒

On comparing both sides we have;

and b = 16

Therefore, the value of a is, 81

2x^2+5x+17

your welcome. : )

94

step-by-step explanation:

average the numbers and use a variable to figure out the minimum to get a 90.

(79+94+91+92+x)/5=90

x = 94