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Factoring Videos 19 videos
ACT Math Intermediate Algebra Drill 1, Problem 4. Solve for x based on the equation.
ACT Math Intermediate Algebra Drill 1, Problem 5. Can you simplify the expression?
ACT Math Intermediate Algebra Drill 2, Problem 1. Solve the equation.
ACT Math 1.4 Intermediate Algebra 461 Views
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Description:
ACT Math Intermediate Algebra Drill 1, Problem 4. Solve for x based on the equation.
Transcript
- 00:02
And here is a shmoop question...
- 00:04
Solve: x2 + 6x = 0
- 00:08
And here are the potential answers...
- 00:13
Okay Just looking at the problem, it should cry out to us that it's a factor problem.
- 00:17
And we know we can factor an x out of there
Full Transcript
- 00:20
So... let's do it.
- 00:21
We have x times the quantity x plus 6.
- 00:23
So... x has to equal at least 0 here because 0 squared is 0 and 6 times 0 is... also zero.
- 00:31
But what else can x be? Well, we have this quantity here; x plus 6.
- 00:34
So... if x was NEGATIVE 6, this piece would be zero... and zero times anything is zero...
- 00:40
so negative 6 works as well.
- 00:42
...and our answer is D.
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