Question

what is the smallest number that should be added to 49a^2 + 64ab + 9b^2 to make it a perfect square​

Answer 1

Step-by-step explanation:

(7a)² +(3b)² + 2×7a×3b = 49a²+9b²+ 42ab --A

given question -A = 22ab

so the no. that should be added to the given expression is

-22ab

when -22ab is added then the expression is (7a+3b)²