Question

Compute the following using the expansion (a+b)² = a²
+2ab or (a - b)² = a-2ab +b²

(9.7)²​

Answer 1

$\huge \frak{ {(9.7)}^{2} } \: \: \: \: Or \: \: \: \: ( \frac{97}{10} )^{2} \\ \\ \\ = > ( \frac{100 - 3}{10} )^{2} \\ \\ = > {(100 - 3)}^{2} \times \frac{1}{100} \\ = > {(100)}^{2} + {(3)}^{2} - 2(100)(3)[( \frac{1}{100} )] \\ = > 10000 + 9 - 600[ \frac{1}{100} ] \\ = > 9409[ \frac{1}{100} ] \\ = > \: \: \: \: \red{94.09}$