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12-21.
  1. If f(x) = 3x − 9 and g(x) = −x2, find: Homework Help ✎

    1. f(−2)

    2. g(−2)

    3. x if f(x) = 0

    4. g(m)

Substitute the value for x.
f(−2) = 3(−2) − 9
Continue to simplify.

Substitute the value for x.
g(−2) = −(−2)2
Continue to simplify.

Substitute 0 for f(x).
0 = 3x −9
Continue solving for x.

Substitute the value for x.
g(m) = −m2