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Algebraic Identities

i Use the ide...

Question

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)

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Solution

$(x + 3) (x + 7) = (x)^{2} + (3 + 7) x + 3 \times 7$
$= x^{2} + 10 x + 21$ $[U s i n g i d e n t i t y (x + a) (x + b) = x^{2} + (a + b) x + a b]$

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