Function Review

Function Review

Function notation is f(x)=mx+b

Yes it is similar to lines!

f(x) is our y and output

x is our x and input

Evaluate f(x) = x+2 when x=7?

This means we plug 7 in for x

f(7)=7+2

f(7)=9

Evaluate f(x) = 5-x when x=2 ?

This means we plug 2 in for x

f(2) = 5-2

f(2) = 3

So Remember if they give us x

We just plug it in.

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Evaluate f(x) = x+3 when x = 5

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Evaluate f(x) = 10 - x when x = 3?

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Evaluate f(x) = 3x when x = -2?

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Evaluate f(x) = x/3 when x= 12?

Find the value of x so that the function has the given value.

f(x) = x+7 and f(x) = 10

make them equal

x +7 = 10

-7 -7

x = 3

Find the value of x so that the function has the given value.

f(x) = 2x and f(x) = -16

make them equal

2x = -16

/2 /2

x = -8

So Remember if they give us f(x) and another f(x)

Then make them equal.

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Find the value of x so that the function has the given value.

f(x) = x + 4 and f(x) = 6

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Find the value of x so that the function has the given value.

f(x) = x-7 and f(x) = 5

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Find the value of x so that the function has the given value.

f(x) = 3x and f(x) = 15