Question

(99)^2, find value by identity​

Answer 1

${99}^{2} = ( {100 - 1)}^{2} \\ \\ {99}^{2} = {100}^{2} + 1 - 200 \\ \\ {99}^{2} = 10000 - 199 \\ \\ {99}^{2} = 9801$