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Quadratic Equations Videos 18 videos
ACT Math Intermediate Algebra Drill 1, Problem 3. Can you find the value of a in this expression?
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...
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?
SAT Math 9.2 Algebra and Functions 377 Views
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Description:
SAT Math 9.2 Algebra and Functions
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.
Full Transcript
- 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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