Question
Expand the following$:(x - 5) (x - 4)$
✓
Answer
$(x - 5) (x - 4)$
$= x^2 -5x - 4x + 20$
$= x^2 - 9x + 20$
$($Using identify : $(x - a) (x - b))$
$= x^2 - (a + b) x + ab).$
$= x^2 -5x - 4x + 20$
$= x^2 - 9x + 20$
$($Using identify : $(x - a) (x - b))$
$= x^2 - (a + b) x + ab).$
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