Question

Evaluate using the proper identity (20.6)²​

Answer 1

$\sf\small\underline\blue{Using:-}$

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

we ca write in

${(10.5)}^{2} = {(10 + 0.2)}^{2}$

${10}^{2} + 2(10)(0.2) + {(0.2)}^{2}$

$= 100 + 4 + 0.04$

$\sf\small\underline\blue{Now answer:-}$

$\huge\underline{\overline{\mid\star\sf{\purple{104.04}}\star\mid}}$