Question
Factorise: $2 x^2+x-45$
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Answer
$2 x^2+x-45$
$=2 x^2+10 x-9 x-45$
${2 × (-45) = -90, -90 = (10) × (-9), 1 = 10 - 9}$
$= 2x(x - 5) + 9(x - 5) $
$= (x - 5)(2x + 9)$
$=2 x^2+10 x-9 x-45$
${2 × (-45) = -90, -90 = (10) × (-9), 1 = 10 - 9}$
$= 2x(x - 5) + 9(x - 5) $
$= (x - 5)(2x + 9)$
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