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
\(\displaystyle{-48}\)
Proportions
Proportions

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

Proportions
Proportions
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
\(\displaystyle{-20}\)
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