Solve for X and Find P(-2) | Helpful Homework Solutions

  • Thread starter Sope0nARope
  • Start date
In summary, the individual is seeking help with three problems on their homework, including solving for x using the quadratic formula and finding a specific value in a polynomial equation. They have attempted the problems but are not confident in their answers and are open to receiving guidance.
  • #1
Sope0nARope
2
0
i'm havin trouble with a few problems on my homework so help would be much appriciated

solve for x:

1) 3x^2 - 2x +1=0

2) x^2 -4x + 20 = 0

3) (-2/x+1) + (3/1-x) = 7/x^2-1

and
find p(-2) if P(x) = 2x^4 - x^3 + 4x^2 + -8x + 3

again thanks for any help :)
 
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  • #2
Look up the quadratic formula for the first three.

For the last one, substitute -2 in everywhere you see x, multiply and add them together.

If you post an attempt, we can help you a bit more.
 
  • #3
i didnt think of using the quadratic formula i tried it but it still doesn't seem right i got
x=2/3 + or - i root60/6 for the 1st 1

and x = 6,-2 for the 2nd i must be doing something wrong
 
  • #4
I've got complex answers for both of the first two as well, but they don't match your results. Probably missed a '-' sign somewhere.

For the third one, it looks like your parenthesis are a bit ambiguous.

(-2/x+1)

Is this (-2/x) +1 or -2/(x+1)?

Can you post your work, and we'll find the errors?
 

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