Question
Find the following products: $(x + 7)(x - 5)$
✓
Answer
Here, we will use the identity $(x + a)(x - b) = x^2+ (a - b)x - ab.$
$(x + 7)(x - 5)$
$= x^2+ (7 - 5)x - 7 × 5$
$= x^2+ 2x - 35$
$(x + 7)(x - 5)$
$= x^2+ (7 - 5)x - 7 × 5$
$= x^2+ 2x - 35$
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