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is this correct

Find the constant term that should be added to make the following expression a perfect square trinomial

x^2 + 7x

My answer that i got was

12.25

Take half of seven, square it.

7/2 squared is 49/4. You are right.

should i leave it as a decimal or a fraction

I would do it as a fraction.

Leaving the answer as a fraction, in this case, would be more accurate and precise. So the constant term that should be added to make the expression x^2 + 7x a perfect square trinomial is 49/4.