Question

Evaluate 3+sqrt of x+7 - sqrt 3x when x = 9. Write the answer as a decimal. Round to the nearest hundredth if necessary.

Answer 1

\[\large 3 + \sqrt{x+7} - \sqrt{3x}\]

Like that?

Answer 2

yes

Answer 3

so... sub in your 9 in replace of all x's and show us the new equation!

Answer 4

Okay...so when x = 9 you plug in 9 for every 'x' in that equation

\[\large 3 + \sqrt{9 + 7} - \sqrt{3(9)}\]
\[\large 3 + \sqrt{16} - \sqrt{27}\]
\[\large 3 + 4 - \sqrt{27}\]

Can you solve it from here?

Answer 5

no i'm terrible at this