Question

use a suitable identity to get each of the following products.

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Answer 1

$using \: identity\: ( a - b) ^{2} = {a}^{2} - 2ab + {b}^{2}$
$(3a - \ \frac {1}{2} )^{2}$
$(3a)^{2} + (\frac{1}{2} )^{2} - 2 \times 3a \times \frac{1}{2}$
${9a}^{2} + \frac{1}{4} - \frac{6a}{2}$
$9a^{2} + \frac{1}{4} - 3a$
$9a^{2} - 3a + \frac{1}{4}$