Question

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Expand :
(a + b + 5)²
EXAMPLES FOR PRACTICE

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Answer 1

$\left(a+b+5\right)^2$

$=\left(a+b+5\right)\left(a+b+5\right)$

$=aa+ab+a\cdot \:5+ba+bb+b\cdot \:5+5a+5b+5\cdot \:5$

$=aa+ab+5a+ab+bb+5b+5a+5b+5\cdot \:5$

$\bf{=2ab+a^2+10a+b^2+10b+25}$