Question

simplify.
$3\sqrt{15} - 9\sqrt{15} = \square$

Explanation:

Step1: Identify like terms

Both terms have $\sqrt{15}$, so we can factor out $\sqrt{15}$.
Expression: $3\sqrt{15} - 9\sqrt{15}=(3 - 9)\sqrt{15}$

Step2: Subtract the coefficients

Calculate $3 - 9=-6$.
Expression: $-6\sqrt{15}$

Answer:

$-6\sqrt{15}$