Question

Which of the following algebraic expression must be added to a² + b² to make it a perfect square

Options
A. 2a
B. 2ab
C. 2b
D. ab
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Answer 1

Answer:

2ab

Step-by-step explanation:

We know that

(a+b)²=a²+b²+2ab

therefore 2ab must be added to a²+b² to make it a perfect square

Answer 2

Answer:

B) 2ab

Step-by-step explanation:

You gotta add 2ab to a²+b² to make it a perfect square. After the addition, it'll become: a²+b²+2ab which is a perfect square i.e., the expansion for (a+b)².