MATH HELP! My teacher hates me.?

Question

My teacher hates us and gives homework over winter break.

Solve for X:

x^3 = 9x

a) {0,3,9}
b) {-9, 0, 9}
c) {0, 9)
d) {-3, 3}
e) {-3, 0, 3}
f) None of the above.

And please, don't say None of the above unless it's really N/A. Thanks!

Answer 1

Solve by factoring:

x^3 = 9x
x^3 - 9x = 0
x (x^2 -9) = 0
x (x + 3) ( x - 3) = 0

Solve for x:
x = 0
x = -3
x = +3

So, the answer is "E".

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You can check your work by plugging in those values:
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x^3 = 9x
0^3 = 9*0
0 = 0 <--- Checks!

x^3 = 9x
-3^3 = 9 *(-3)
-27 = -27 <--- Checks!

x^3 = 9x
3^3 = 9 * 3
27 = 27 <--- Checks!

Good luck in your studies,
~ Mitch ~

Answer 2

Your teacher doesn't hate you. Your teacher is trying to help you get an education. Math skills will help you get a good job and keep that job. My observation is that many people go to school to learn and while there, resist learning. People want an education, but don't want to do the work to make it a reality.

I don't mean to rag on you, just trying to make a point. Good luck with your math. It is important.
.

Answer 3

x^3=9x.......make x= to all the numbers in the answers

0 works.......0^3=9x0 or 0=0........3 works too 27=27
-3 works too -27=-27..........9 does NOT work 729=81
-9 does NOT work either...-729= -81....so E is the answer.

Answer 4

X^3=9x
X^3/X=9/X
X^2=9
X=+3 OR --3

So, the answer is D!!

Answer 5

The answer is (e). If you need additional math homework help you can go to http://www.gobakersfield.net and click on goEducation, you will find useful resources. In addition, you can use the Algebrator for FREE to complete you Algebra Homework.... Hope this helps!

Answer 6

Why don't you work it out and tell us what you think the answer is! At least try first!