Question

(7 - √54) - (5 + √24)

Answer 1

You combine like terms...so this would be 2-√54-√24.
However, you probably have to simplify the radicals to:
2-3√6-2√6=2-√6

Answer 2

\[(7 - 3\sqrt{6}) - (5 + 2\sqrt{6})\]\[7 - 3\sqrt{6} - 5 - 2\sqrt{6} = 2 - 5\sqrt{6}\]

Answer 3

oops...it's 2-5√6 :d