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Quadratic Equations Videos 18 videos

ACT Math 1.3 Intermediate Algebra
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ACT Math Intermediate Algebra Drill 1, Problem 3. Can you find the value of a in this expression?

CAHSEE Math 4.2 Algebra and Functions
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Algebra and Functions: Drill 4, problem 2. If the function for the area of a circle with respect to its diameter was graphed in the first quad...

CAHSEE Math 4.3 Algebra and Functions
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Algebra and Functions: Drill 4, Problem 3. The sum of the quadratic parent function and the line given has which of the following as its graph?

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SAT Math 9.2 Algebra and Functions 377 Views


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Description:

SAT Math 9.2 Algebra and Functions

Language:
English Language

Transcript

00:02

Put this in your calculator and shmoop it.

00:05

If the square root of 25 minus x squared equals 3, then what is one possible positive value of x?

00:15

So we want to find this “x” fellow. In other words… we want to isolate it.

00:20

The side of the equation that contains x is under a square root.

00:23

We can undo this situation by squaring both sides, getting us 25 – x squared = 9.

00:31

Then, we subtract 25 from each side to further isolate x. Now we’re working with –x squared = -16.

00:40

Both sides are negative, so we can multiply both sides by -1 to get x squared = 16.

00:46

From here, pretty simple. Take the square root of both sides, and we get 4.

00:50

But don’t forget it can be positive OR negative.

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