Question
Factorise the following by grouping the terms$:x(x - 4)- x + 4$
✓
Answer
$x(x - 4) - x + 4$
$= x(x - 4) - 1(x - 4)$
$= (x - 4)(x - 1).$
$= x(x - 4) - 1(x - 4)$
$= (x - 4)(x - 1).$
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