Question

What value in the place of the question mark makes the polynomial a perfect square trinomial

9. x^2+30x+?
10. x^2-?x+49

Answer 1

Check this attachment

Answer 2

9. 225

10. 14

Explanation:

9.

Divide the coefficient of x by 2 and square it.

30/2 = 15

15^2 = 225

Answer: 225

10.

When you divide the middle coefficient by 2 and square it, you get the constant term (the third term). Here, the constant term is 49. 49 is the square of 7. Double 7 to get 14.

Answer: 14