ACT Math 6.1 Elementary Algebra
ACT Math: Elementary Algebra Drill 6, Problem 1. Which of the following is not a factor of x3 – x?
|ACT Math||Elementary Algebra|
|ACT Mathematics||Elementary Algebra|
|Elementary Algebra||Factoring polynomials|
Solve quadratic equations by factoring
|Foreign Language||Arabic Subtitled|
|Product Type||ACT Math|
If we pull out that x...
...we get x times the quantity x squared minus 1.
But now we have x squared minus 1... it's a magic number we should recognize.
X squared minus 1 is a factorable beast...
...in quantity x plus 1 times quantity x minus 1.
So the factors are x... then quantity x plus 1... then quantity x minus 1.
If we look down our answers list, the only factor left that ISN'T an element of this
equation is x squared plus 1...
... so the answer is... E.