Question

Evaluate using algebraic formula:

9.7²

Answer 1

9.7²

Let’s take it as (10 − 0.3)²

(10 − 0.3)² = (10)² − 2(10)(0.3) + (0.3)²   ...[Using (a − b)² = a² − 2ab + b²]

(10 − 0.3)² = 100 − 2(3) + 0.09

(10 − 0.3)² = 100 − 6 + 0.09

∴ (10 − 0.3)² = 94.09