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Evaluating Expressions

# Evaluating Expressions

Try the problem below. After you try the problem, you can watch a video to see a correct solution.
If $$a = 2$$ and $$b = - 3$$, evaluate $$a^2 b - a b ^ 2$$
 A $$\displaystyle{-30}$$ B $$\displaystyle{-24}$$ C $$\displaystyle{0}$$ D $$\displaystyle{6}$$ E $$\displaystyle{-48}$$

After watching the video, try this problem to practice more.

If $$a = 1$$ and $$b = -5$$, evaluate $( a - b )^2 - ( a + b )^2$
 A $$\displaystyle{4}$$ B $$\displaystyle{0}$$ C $$\displaystyle{20}$$ D $$\displaystyle{52}$$ E $$\displaystyle{-20}$$