Which of the following is the correct expansion of the given identity?
$(x + a) (x + b)$

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

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

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

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

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Solution

The correct option is A $x^{2} + (a + b) x + a b$
The expansion of the identity,
$(x + a) (x + b) = x^{2} + (a + b) x + a b$

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