Question

Use (a+b)^2 = a^2 + 2ab + b^2 to evaluate the following:
(i) (10.2)^2
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Answer 1

$\bold{ = {(10.2)}^{2} }$

$\therefore\bold{ = (10 + 0.2) ^{2} }$

$\bold{ = {(10)}^{2} +( 2 \times 10 \times 0.2) + {(0.2)}^{2} }$

$\bold{ = 100 + 4 + 0.04}$

$\bold{ = 104.04}$

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