ACT Math 1.4 Intermediate Algebra

ACT Math Intermediate Algebra Drill 1, Problem 4. Solve for x based on the equation.

ACT MathIntermediate Algebra
ACT MathematicsIntermediate Algebra
AlgebraFactoring
Elementary AlgebraSolve quadratic equations by factoring
Foreign LanguageArabic Subtitled
Chinese Subtitled
Korean Subtitled
Spanish Subtitled
Intermediate AlgebraQuadratic equations (Quadratic Formula)
LanguageEnglish Language
Product TypeACT Math

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.