Question

so this is evaluating functions and "evaluate the function when x = 2, x = 0 and x = -2

1. f(x) = 3x

2. g(x) = -x - 6

3. h (x) = 8x + 7

what do the variables at the beginning of the equation mean? (the f , g and the h) thanks :)

Answer 1

f(x) = y
g(x) = y
h(x) = y

whenever you see: "letter(letter)", you know it is y. And y is the y value on the Cartesian coordinate plane. Evaluating the function means solve for y, so just plug in the numbers you are given into x (aka substitution) and your "y" value is your answer.

Answer 2

so can you solve one of the problems for me as an example because I don't really understand what you're saying?

Answer 3

1.

<b>Question: f(x) = 3x</b>

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Step 1:

State the given.
You are given x=2, x=0, and x=-2.

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Step 2:

Plug in(A.K.A. "substitute) the numbers.
Plug in 2 for x in "3x". Plug in 0 for x in "3x". Plug in -2 for x in "3x". THESE ARE THREE DIFFERENT EQUATIONS NOW, DON'T GET THEM CONFUSED!

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Step 3:

Solve.

3 * 2 = 6
3 * 0 = 0
3 * -2 = -6

<b>(2, 6) | (0, 0) | (-2, -6) are your data points.</b>

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Now try and do the same thing for the other two problems