Question
Factorise the following.
$a^2- 16p - 80$
$a^2- 16p - 80$
✓
Answer
$a^2- 16p - 80$
$= a^2- (20 - 4)p - 80$
$= a^2- 20p + 4p - 80$
$= a(a - 20) + 4(p - 20)$
$= (a - 20)(a + 4)$
$= a^2- (20 - 4)p - 80$
$= a^2- 20p + 4p - 80$
$= a(a - 20) + 4(p - 20)$
$= (a - 20)(a + 4)$
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