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Home > CC4 > Chapter A > Lesson A.1.5 > Problem A-56

A-56.

A-56. Calculate the following values. Homework Help ✎

  1. If y = 2 + 4.3x, what is the value of y when x = −6?

  2. If g(x) = (x − 3)2, what is the value of g(−9)?

  3. If C(x) = x − 2, what is the value of x when C(x) = 3.5?

  4. If y = 5x2 − 4, what is the value of y when x = −2?

Substitute −6 in for x.
y = 2 + 4.3( −6 )

Multiply and simplify.

y = 2 + (−25.8)

y = −23.8

Follow the steps in part (a).

Remember to use the correct order of operations.

Begin by substituting 3.5 for x in the equation.

Rewrite the equation as y = 5(−2)² − 4.

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