Question

Evaluate using algebraic formula:

10.2²

Answer 1

10.2²

Let’s take it as (10 + 0.2)²,

(10 + 0.2)² = (10)² + 2(10) (0.2) + (0.2)²   ...[Using (a + b)² = a² + 2ab + b²]

(10 + 0.2)² = 100 + 2(2) + 0.04

(10 + 0.2)² = 100 + 4 + 0.04

∴ (10 + 0.2)² = 104.04