Question

one plus b ka whole square

Answer 1

(a+b)² = a² + b² + 2ab

=> (1+b)² = (1)² + (b)² + 2(1)(b)
= 1 + b² + 2b
= b² + 2b + 1

Hope it helps

Answer 2

(1 + b)^ 2 = 1 ^2 + 2×1×b + b^2
= 1 + 2b + b^2