Question

what must be subtracted from 9a^2+25b^2 to make the remainder a perfect square​

Answer 1

Answer:

± 30ab

Step-by-step explanation:

There are two possible situations:

1). 9a² - (+30ab) + 25b² = (3a - 5b)²

2). 9a² - (- 30ab) + 25b² = (3a + 5b)²