Question

Evaluate the following by using identity-1

$(8.1) {}^{2}$

Answer 1

8.1 × 8.1
65.61
I HOPE IT'S HELP YOU

Answer 2

$(8.1) = (8 + 0.1) {}^{2} \\ \: \: \: \: \: \: \: \: \: \: \: = 8 {}^{2} + 2 \times 8 \times 0.1 + 0.1 ^{2} \\ \: \: \: \: \: \: \: \: \: \: \: = 64 + 0.16 + 0.01 = 65.61$

here is you answer