Question

Expand the following using the appropriate formulae;
a) (9h+2k)²​

Answer 1

Answer attached...

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Answer 2

Answer:

$(a + b) {}^{2} = {a}^{2} + {b}^{2} + 2ab$

Hence,

$(9h + 2k) {}^{2} =$

$= (9h)^{2} + (2k) {}^{2} + 2 \times (9h) \times (2k)$

$= 81h {}^{2} + 4 {k}^{2} + 18hk$

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