Question

By using identity, find the product of 7.5 X 7.8​

Answer 1

$\huge \mapsto \tt \: 7.5 \times 7.8 \\ \\ \large \leadsto \tt( 8 - 0.5 )(8 - 0.2) \\ \\ \large \leadsto \tt {(8)}^{2} - 1.6 - 4 + 1 \\ \\ \large \leadsto \tt64 - 5.6 + 1 \\ \\ \large \leadsto \tt65 - 5.6 \\\large \leadsto \sf 59.4$