You can put this solution on YOUR website! You have this:
2 + 3(sqrt{7})/4
You have to multiply the numerator and denominator by the conjugate.
I will set it up and allow you to multiply.
[2 + 3(sqrt{7})/4] TIMES [2 - 3(sqrt{7})]/[2 - 3(sqrt{7})]
Can you finish now?