Question
Factorise : $40 + 3x - x^2$
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Answer
$40 + 3x - x^2$
$= 40 + 8x - 5x - x^2$
$= 8(5 + x) - x(5 + x)$
$= (5 + x)(8 - x)$
$= 40 + 8x - 5x - x^2$
$= 8(5 + x) - x(5 + x)$
$= (5 + x)(8 - x)$
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