Question

simplify.
$9\sqrt{7} - 3\sqrt{7} = \square$

Explanation:

Step1: Identify like terms

Both terms have $\sqrt{7}$, so they are like terms.

Step2: Combine coefficients

Subtract the coefficients: $9 - 3 = 6$.

Step3: Multiply by the radical

Multiply the result by $\sqrt{7}$: $6\sqrt{7}$.

Answer:

$6\sqrt{7}$