Question
Factorise:
$9 a^2+3 a-8 b-64 b^2$ [
Hint. Given Exp. $\left.=\left(9 a^2-64 b^2\right)+(3 a-8 b)\right]$
$9 a^2+3 a-8 b-64 b^2$ [
Hint. Given Exp. $\left.=\left(9 a^2-64 b^2\right)+(3 a-8 b)\right]$
✓
Answer
(3a - 8b) (3a + 8b + 1)
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