Question

Evaluate the following using suitable identities

Answer 1

(99)^2

(100-1)^2

(100)^2+(1)^2-2×100×1

10000+1- 200

10001-200

799

Answer 2

${(90 + 9)}^{2} \\ {90}^{2} + {9}^{2} + 2 \times 90 \times 9 \\ 8100 + 81 + 1620 \\ 9801$

this wil help u