Problem
\( 9\left(x^{2}-2\right) \)
Solution
Step 1 ：\( 9\left(x^{2}-2\right) = 9x^{2} - 9(2) \)
Step 2 ：\( 9x^{2} - 9(2) = 9x^{2} - 18 \)
Step 1 ：\( 9\left(x^{2}-2\right) = 9x^{2} - 9(2) \)
Step 2 ：\( 9x^{2} - 9(2) = 9x^{2} - 18 \)
