Question
Factorise:
$x^2-17 x+16$
$x^2-17 x+16$
✓
Answer
$x^2-17 x+16$
$=x^2-x-16 x+16$
$\{16=(-1) \times(-16), 17=-1-16\}$
$=x(x-1)-16(x-1)$
$=(x-1)(x-16)$
$=x^2-x-16 x+16$
$\{16=(-1) \times(-16), 17=-1-16\}$
$=x(x-1)-16(x-1)$
$=(x-1)(x-16)$
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