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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.

Language:
English Language

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

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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