Question

3.The side of a square frame is (2b - 1) inches. Find its area.

Note: Area of a square
s2, where s = side of a square​

Answer 1

Explanation:

(a - b)² = a² + 2ab + b²

Area of square frame =side²

= (2b - 1)²

= (2b)² - 2*2b * 1 + 1²

= 4b² - 4b + 1