math question?

Question

i want to see if i did this right.
3square root(2x^2+4)
X=(1/2)
the answer is 7 right?

Answer 1

No :
if x = 1/2 then 2x² + 4 = 2*(1/4) + 4 = 1/2 + 4 = 9/2

sqrt(9/2) = 3sqrt(1/2)

3sqrt(2x² + 4) = 9 sqrt(1/2) and not 7

Answer 2

yes