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

A-56.

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

If

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

*g*(*x*) = (*x*− 3)^{2},^{ }what is the value of*g*(−9)?If

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

*y*= 5*x*^{2}− 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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