Question
Factorise: $x^2-22 x+117$
✓
Answer
$x^2-22 x+117$
$=x^2-13 x-9 x+117$
${117 = (-13) × (-9), -22 = -13 - 9}$
$= x(x - 13) - 9(y - 13) $
$= (x - 9)(x - 13)$
$=x^2-13 x-9 x+117$
${117 = (-13) × (-9), -22 = -13 - 9}$
$= x(x - 13) - 9(y - 13) $
$= (x - 9)(x - 13)$
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