+219 (8z − 9)(8z + 9) = az2 − b
First you must swich sides:
az * 2 - b = (8z - 9) (8z + 9)
Add b to both sides
az * 2 - b = (8z - 9) (8z + 9)
az * 2 - b + b = (8z - 9) (8z + 9) + b
Then symplify
az * 2 = (8z - 9) (8z + 9) + b
Then divide both sides by z * 2
\(\frac{az*2}{z * 2}\) \( = \frac{(8z - 9)(8z + 9)}{z*2}+\frac{b}{z*2}\)
Then symplify
\(a = \frac{(8z-9)(8z+9)+b}{2z}\)
Hope this helps ;P
