Q2 of 59 Page 263

Evaluate the following by using suitable identities:
799²

Given: 799² = (800-1)² = (800)²-2(800)(1) + (1)²

= 6400 + 1600 + 1, where a = 800 and b = 1 in the identity (a-b)² = a²-2ab + b²

= 8001

Evaluate the following by using suitable identities:

509²

Evaluate the following by using suitable identities:

992²

Evaluate the following by using suitable identities:

304 × 296

Evaluate the following by using suitable identities:

83 × 77

Questions · 59

11. Algebraic Expressions

1 1 1 1 1 2 3 4 4 4 4 4 5 6 7 1 2 3 4 5 6 7 8 1 1 1 1 2 2 2 2 3 3 3 3 4 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 1 1 1 2 2 3 3

Evaluate the following by using suitable identities:7992