Posted by **chrissy** on Tuesday, August 4, 2009 at 12:01pm.

3x^(1/3) + 2x^(2/3) = 5

solve for x

- math -
**MathMate**, Tuesday, August 4, 2009 at 2:27pm
Use the substitution

u=x_{(1/3)}

The original equation

3x^(1/3) + 2x^(2/3) = 5

now becomes

3u + 2u² = 5

Solve by the quadratic formula for u, and finally replace u by x_{(1/3)}.

- math -
**MathMate**, Tuesday, August 4, 2009 at 2:28pm
Sorry, _{(1/3)} should read ^{(1/3)}

- math -
**MathMate**, Tuesday, August 4, 2009 at 2:29pm
I'll try it again:

x_{(1/3)} should read x^{(1/3)}

## Answer This Question

## Related Questions

- Math - We have an important chemsitry test due and I want to make sure that I do...
- English - 1. He can not solve the math problem. 2. He cannot solve the math ...
- MATH PLEASEEEEE - I have a question, if f(x)=x/2 and g(x)=3x+1 find: a) (f+g)(x...
- math - actually, in a addition to the question i posted a few minutes ago, can ...
- Math - Solve by eliminnation methods 2x-4y=5 2x-4y=6 solve the system by ...
- MATH PLEASE HELP! - Solve each system 3x+2y= -2 9x- y= -6 I know how to solve ...
- Math - Solve for S: r^2s-5s=7. Solve for b: L= 4a^2b. I'm confused about how to ...
- math - solve for the indicated variable: a. temperature formula solve for F: K=5...
- math - Solve systems by substitution 5x - 2y = -5 y - 5x = 3 Substitute 5x + 3 ...
- Math Analysis - 6. Prove that f(x) = (3/4)x^4 + 2 and g(x) = (4sqrt(108x-216))/3...

More Related Questions