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ACT Mathematics Videos 164 videos
ACT Math: Coordinate Geometry Drill 1, Problem 1. Which inequality is expressed by the number line?
ACT Math: Intermediate Algebra: Drill 3, Problem 1. Find the fifth number in the series.
ACT Math: Pre-Algebra Drill 1.2. What proportion of Jenna's day is spent Wii-swimming?
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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