Subtract. Write your answer in simplest form. \[ 9 \sqrt{35}-5 \sqrt{35} \]

To subtract the expressions \( 9\sqrt{35} \) and \( 5\sqrt{35} \), you can combine the like terms by subtracting their coefficients: \[ 9\sqrt{35} - 5\sqrt{35} = (9 - 5)\sqrt{35} = 4\sqrt{35} \] Since \(\sqrt{35}\) cannot be simplified further (as 35 factors into 5 and 7, which are both prime numbers), the expression is already in its simplest form. **Answer:** \(4 \sqrt{35}\)