Question

what should be added to 25x² + 9y² to make it a perfect square​

Answer 1

Answer:

Number to be added to (25x²+9y²) to make it pwrfect square is 15xy

Step-by-step explanation:

Let the number be 'a'

25x² + 9y² + a = (5x+3y)²

Note: I got (5x + 3y)² from root 25x² and root 3y². Its nearest square

25x² + 9y² + a = 25x² + 9y² + 15xy

Cut 25 x² and 9y² from both sides

a=15xy