Question
Factorise the following.
$x^2+ 4x - 77$
$x^2+ 4x - 77$
✓
Answer
$x^2+ 4x - 77$
$= x^2+ (11 - 7)x - 77$
$= x^2+ 11x - 7x - 77$
$= x(x + 11) - 7(x + 11)$
$= (x + 11)(x - 7)$
$= x^2+ (11 - 7)x - 77$
$= x^2+ 11x - 7x - 77$
$= x(x + 11) - 7(x + 11)$
$= (x + 11)(x - 7)$
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