Question
Factorise:
$16 a^2-144$
$16 a^2-144$
✓
Answer
Using: $a^2-b^2=(a+b)(a-b) $
$16 a^2-144=(4 a)^2=(12)^2$
$=(4 a+12)(4 a-12)$
$=4(a+3) \times 4(a-3)$
$=16(a+3)(a-3)$
$16 a^2-144=(4 a)^2=(12)^2$
$=(4 a+12)(4 a-12)$
$=4(a+3) \times 4(a-3)$
$=16(a+3)(a-3)$
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