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