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