Tick (\checkmark) the correct answer in each of the following:
$(x + 4) (x + 4) = ?$

(a) $(x^{2} + 16)$
(b) $(x^{2} + 4 x + 16)$
(c) $(x^{2} + 8 x + 16)$
(d) $(x^{2} + 16 x)$

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Solution

$(x + 4) (x + 4) = x^{2} + (4 + 4) x + 4 \times 4 = x^{2} + 8 x + 16$

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