Question

which value must be added to the expression x^2 + 3x to make it a perfect-square trinomial

Answer 1

2.25.

Your missing the value of c, which equals to b/2^2

3/2=1.5^=2.25

Answer 2

So this factors to (x+1.5)(x+1.5)

Answer 3

If you foil that you get exactly what you started with

Answer 4

know what i mean