math ASAP! please!!

Question

Add a constant to the following to make the expression a Perfect Square Trinomial

1. x2 + 4x + ___ 2. x2 - 8x + ___

3. x2 + 18x + ___ 4. x2 - 16x + ___

Answer 1

To find the c term, the formula is (b/2)² b is the term in the middle. For problem 1, b is 4. Plug this into the formula:

1. (4/2)² = 2² = 4

Answer 2

I will not do these problems for you, but I will tell you the general solution.

x² ± bx +(b/2)² = [x±(b/2)]²