ACT Math Intermediate Algebra Drill 1, Problem 4. Solve for x based on the equation.
|ACT Math||Intermediate Algebra|
|ACT Mathematics||Intermediate Algebra|
|Elementary Algebra||Solve quadratic equations by factoring|
|Foreign Language||Arabic Subtitled|
|Intermediate Algebra||Quadratic equations (Quadratic Formula)|
|Product Type||ACT Math|
So... let's do it.
We have x times the quantity x plus 6.
So... x has to equal at least 0 here because 0 squared is 0 and 6 times 0 is... also zero.
But what else can x be? Well, we have this quantity here; x plus 6.
So... if x was NEGATIVE 6, this piece would be zero... and zero times anything is zero...
so negative 6 works as well.
...and our answer is D.