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(x + a)(x +b)= x^2 + x(a+ b) + ab

Evaluate z+12...

Question

$Evaluate (z + 12) (z + 10) .$

z^{2} + 120 z + 22

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z^{2} + 22 z + 120

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z + 22 z + 120

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z^{2} + 11 z + 120

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Solution

The correct option is B $z^{2} + 22 z + 120$
$Using identity (x + a) (x + b) = x^{2} + x (a + b) + a b$
$(z + 12) (z + 10) = z^{2} + z (12 + 10) + 12 \times 10 = z^{2} + 22 z + 120$

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