1.

Using identities evaluate:1 .71² 2.99²

Answer»

use (a+b)² = a² + b² + 2ab71²(70+1)² = 70² + 1² + 140 = 4900 + 141 = 5401

Use (a-b)² = a² + b² - 2ab2.99²(3 - 0.01)² = 3² + (0.01)² - 0.06 = 8.9401



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