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Mathematics and Statistics Assessment Videos 200 videos

TSI Math: Writing the Slope-Intercept Equation of a Graphed Line
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What is the equation of the line graphed above?

TSI Math: Plugging in Slope and Point to Find the Equation of a Line
12 Views

A line passes through the point (-4, -4) and has a slope of . What is its equation?

TSI Math: Using Intercepts to Find the Slope of a Line
5 Views

Line A has an x-intercept of -4 and a y-intercept of 8. What is its slope?

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TSI Math: Recognizing the Axis of Symmetry in a Quadratic Equation 8 Views


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Description:

What is the axis of symmetry of the parabola given by the equation -3x² + 42x – y = 0?


Transcript

00:02

Okay sy mass Shmoop for what is the axis of

00:04

symmetry of the parabola given by the equation Negative three

00:08

x squared plus forty two x minus y equals zero

00:14

Okay well first things first let's Add why to both

00:17

sides to write the given equation in standard form right

00:20

y equals mx plus b So here it is y

00:23

equals negative three x squared plus forty two x What

00:26

when a quadratic equation is written in the form why

00:29

equals a x squared plus b x plus c the

00:32

access of symmetry by definition here is the line x

00:37

equals negative b over two a and like you just

00:40

had to know that formula The vertical line passes through

00:43

the vertex in the middle of the problem right there

00:47

So here b is forty two and a is well

00:52

negative three so we've got negative forty two overnegative six

00:56

there and that equals seven So thie axis of awesome

01:01

for the given parable of there is x equal seven

01:05

and that's it The answer is c

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