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ACT Math 4.3 Intermediate Algebra 229 Views
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Description:
ACT Math: Intermediate Algebra Drill 4, Problem 3. Which equation has an x intercept at 1?
Transcript
- 00:03
Put this in your calculator and shmoop it...
- 00:05
Which equation has an x intercept at 1?
- 00:09
And here are the potential answers...
- 00:14
How do we solve this problem?
- 00:16
Well, we just plug in the point on the graph... so when the x intercept is 1, the y coordinate
Full Transcript
- 00:22
has to be 0... and we are at the point 1, 0.
- 00:26
We can just brute force the answer by plugging in for equation A, here:
- 00:36
We have 1 squared which is 1... minus 3, which is negative 2... then add 4 to get positive
- 00:40
2, which... doesn't fit.
- 00:43
So A is not the droid we're looking for.
- 00:46
Now B. We have 1 minus 2 plus 1, which is...0.
- 00:55
There we go -- don't even need to bother with the others.
- 00:57
B's our boy.
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