Factorise:(x + 5)2 − 4(x + 5)
We have:
$(x+5)^{2}-4(x+5)=(x+5)\{(x+5)-4\}$
$=(x+5)(x+5-4)$
$=(x+5)(x+1)$
$\therefore(x+5)^{2}-4(x+5)=(x+5)(x+1)$
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