IXL - Characteristics of quadratic functions: equations (Algebra 1 practice)

or

Find
the
equation
of
the
axis
of
symmetry
for
the
parabola
y = x² − 3x + 3
.

Simplify any numbers and write them as proper fractions, improper fractions, or integers.

ref_doc_title.

or

Learn with an example

question

Find
the
y -intercept
of
the
parabola
y = x² − x − 1
.

Simplify your answer and write it as a proper fraction, improper fraction, or integer.

key idea

The y-intercept of a parabola is the y-coordinate of the point where the parabola intersects the y-axis.

solution

The y-intercept is on the y-axis, where x = 0. To find the y-intercept, plug x = 0 into the equation and simplify.

y	=	x² − x − 1

	=	(0)² − 0 − 1	Plug in x = 0

	=	^–1	Subtract

So,
the
y -intercept
is
^–1
.

Looking for more? Try these:

Lesson: Quadratic functions

or

$Confetti$

Excellent!

Now entering the Challenge Zone—are you ready?

Questions
answeredQuestions

0

Time
elapsedTime

hr	min	sec
00	00	06

SmartScore
out of 100
IXL's SmartScore is a dynamic measure of progress towards mastery, rather than a percentage grade. It tracks your skill level as you tackle progressively more difficult questions. Consistently answer questions correctly to reach excellence (90), or conquer the Challenge Zone to achieve mastery (100)! Learn more

0

Teacher tools

Work it out

Not feeling ready yet? These can help:

O.1Coordinate plane review

L.3Slope-intercept form: find the slope and y-intercept

L.12Equations of horizontal and vertical lines

Y.1Characteristics of quadratic functions: graphs

Lesson: Quadratic functions