SOLUTION: 3x^-2-27x^-1+42=0 I need help solving for u and back substituting for x. I would appreciate your help. Thanks

Question 61072: 3x^-2-27x^-1+42=0
I need help solving for u and back substituting for x. I would appreciate your help. Thanks
Answer by Earlsdon(6294) (Show Source): You can put this solution on YOUR website!
You can temporarily substitute u for , so rewriting the equation:
Start by factoring a 3.
Aplying the zero product principle:
Factor the the left side:
Apply the zero product principle:
and/or
u = 2 and/or u = 7 Now replace the for u.

---

RELATED QUESTIONS
2(2x+5/3x)^2 -5 = 9(2x+5/3x) This problem is supposed to be solved by substituting a... (answered by stanbon)

I need help solving this problem. 10x^4-27x^2+5=0... (answered by Alan3354,stanbon)

I need help on steps for Solving a system of equations In substituting, Elimination, and... (answered by mathjames,richwmiller)

I need help solving this quadratic equation - -3w^2-6w+3=0 thanks for your... (answered by ewatrrr)

hello, im a student in calculus and i need help on some of the equation solving... (answered by Alan3354)

I need help solving x-2/2 - x+2/4=1/2 Thanks for the... (answered by richwmiller)

I need help on steps for solving a system of equations in substituting,elimination ,and... (answered by Alan3354)

Hello. I do not know if this fits into the right category but I tried my best. Ok so I... (answered by algebrapro18)

i need to find the domain and range for y= 4 over 3x+2 i have the domain as... (answered by longjonsilver,venugopalramana)