Use suitable identity to solve $(x + 3) (x + 3)$

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Solution

$(x + 3) (x + 3) = (x + 3)^{2}$
using identity $(a + b)^{2} = a^{2} + 2 a b + b^{2}$
$(x + 3)^{2} = x^{2} + 2 \times x \times 3 + 3^{2}$
$(x + 3)^{2} = x^{2} + 6 x + 9$

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