Complete the table below, by substituting the given value into the expression and evaluating.

Function Definition Expression Substitution Evaluates to

fx = x + 2$\displaystyle f(x) = x + 2$

f3$\displaystyle f(3)$

3 + 2$\displaystyle 3 + 2$

5$\displaystyle 5$

gx = x - 1$\displaystyle g(x) = x - 1$

g6$\displaystyle g(6)$

hx = 3x$\displaystyle h(x) = 3x$

h4$\displaystyle h(4)$

kx = 2x - 1$\displaystyle k(x) = 2x - 1$

k5$\displaystyle k(5)$

Now that you understand how to evaluate an expression, let’s get some more practice! The table below includes four different functions. Beneath each of them are a collection of different expressions to evaluate.

mx = -2x + 3$\displaystyle m(x) = -2x + 3$ nx = -x + 7$\displaystyle n(x) = -x + 7$ vx = 10x - 8$\displaystyle v(x) = 10x - 8$ wx = x^2$\displaystyle w(x) = x^2$

m3 =$\displaystyle m(3) =$ -23 + 3$\displaystyle -2(3) + 3$

n5 =$\displaystyle n(5) =$

v7 =$\displaystyle v(7) =$

w-2 =$\displaystyle w(-2) =$

-3$\displaystyle -3$

m-4 =$\displaystyle m(-4) =$

n-2 =$\displaystyle n(-2) =$

v0 =$\displaystyle v(0) =$

w10 =$\displaystyle w(10) =$

m0 =$\displaystyle m(0) =$

n3.5 =$\displaystyle n(3.5) =$

v-10 =$\displaystyle v(-10) =$

w0 =$\displaystyle w(0) =$

m0.5 =$\displaystyle m(0.5) =$

n0 =$\displaystyle n(0) =$

v2.5 =$\displaystyle v(2.5) =$

w1.5 =$\displaystyle w(1.5) =$

What do you Notice? What do you Wonder?

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