Question

Evaluate (3x + 5y)² using an identity.​

Answer 1

Answer:

9x²+25y²+30xy

Step-by-step explanation

Given,(3x+5y)²=?

We all know that,(a+b)²=a²+b²+2ab

Putting a=3x,and b=5y,we get

(3x+5y)²=(3x)²+(5y)²+2×3x×5y

             =9x²+25y²+30xy