Question
Factorise: $x^2+13 x+40$
✓
Answer
$x^2+13 x+40$
$=x^2+5 x+8 x+40$
${40 = 5 × 8, 13 = 5 + 8}$
$= x(x + 5) + 8(y + 5) $
$= (x + 5)(x + 8)$
$=x^2+5 x+8 x+40$
${40 = 5 × 8, 13 = 5 + 8}$
$= x(x + 5) + 8(y + 5) $
$= (x + 5)(x + 8)$
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