IXL - Evaluate piecewise-defined functions (Algebra 1 practice)

Find

(

)

for this piecewise-defined function.

(

)

3 8 x – 4	if x < – 3
2 x – 9	if x ≥ – 3

Write your answer as an integer or as a fraction in simplest form.

(

)

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Learn with an example

question

Find

(

–

)

for this piecewise-defined function.

(

)

4 x + 8	if x ≤ – 6
9 x + 1	if x > – 6

Write your answer as an integer or as a fraction in simplest form.

(

–

)

solution

Look at the piecewise-defined function:

(

)

4 x + 8	if x ≤ – 6
9 x + 1	if x > – 6

It uses a different expression on each piece of the function's domain.

It uses
4
x
+
8
for values of
x
that are less than or equal to
–
6
.
It uses
9
x
+
1
for values of
x
that are greater than
–
6
.

You want to find

(

–

)

or the function's value when

–

Since

–

is greater than

–

use the expression

(

–

)

(

–

)

–

Looking for more? Try these:

Lesson: Piecewise functions

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CC.1Evaluate a linear function

A.1Compare and order integers

Lesson: Piecewise functions

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