Use the identity $(x + a) (x + b) = x^{2} + (a + b) x + a b$ to find the following products.
$(x - 3) (x - 4)$

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Solution

$∴ (x - 3) (x - 4)$

$= x^{2} - (3 + 4) x + (3 \times 4)$

$= x^{2} - 7 x + 12$ (Ans)

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(x + a) (x + b) = x^{2} + (a + b) x + a b

(x + 3) (x + 7)

Question 2(i)
Use the identity $(x + a) (x + b) = x^{2} + (a + b) x + a b$ to find the following products:
(x+3)(x+7)