Question

Insert terms to make a identity replace *
(15x+*)^2=225x^2+90xy+*

Answer 1

3y, 9y²

Explanation:

We use laws of binomial

(a+b)²=a²+2ab+b²

From this, we get

15x × * × 2 = 90xy

2×*=6y

*=3y

Now, we square this term to get the last term

3y×3y=9y²