Question

If f(x) = x + 4, find f(3).
If f(x) = −4x − 1, find f(−2).
If g(x) = x2 + 3, find g(4).
If h(x) = 2x + 1, find the value of x if h(x) = 11.
If g(x) = 2(x − 4), find the value of x if g(x) = 20.

Answer 1

For all of these, put the number in parentheses where x is and solve.

First one:

f(3)=3+4
f(3)=7

Answer 2

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Answer 3

The 4th and 5th one replace h(x) or g(x) with that number and solve for x.

4th one:
11=2x+1
10=2x
5=x