College Algebra

posted by .

This is my question 2x^2-8x=-25
I cant seem to figure out how to solve for x?

  • College Algebra -

    Add the -25 to the other side...
    2x^2-8x+25=0,
    Now use the quadratic formula to solve for x...
    Hope this helps

  • College Algebra -

    I was told to start with
    x^2-8x+16=7/2 so where do i go from there?

  • College Algebra -

    2x^2 - 8x =-25
    divide each term by 2

    using completing the square,

    x^2 - 4x = -25/2
    take 1/2 the coefficient of the x term, square it, then add it to each side

    x^2 - 4x +4 = -25/2 +4
    (x-2)^2 = -17/2 or -34/4 , (I anticipated to take √ of both sides)
    x -2 = ± √-34/2 = ± i√34/2

    x = 4/2 ± i√34/2 = (4 ± i√34)/2

    or ... by the formula

    2x^2 - 8x + 25 = 0
    x = (8 ± √-136)/4
    = (8 ± 2√-34)/2
    = (4 ± i√34)/2

  • College Algebra -

    I was told to start with
    x^2-8x+16=7/2 so where do i go from there? That's after / by 2.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Math

    r/5-3=2r/5+16 Please help me solve for r, I just can not seem to figure it out.
  2. Gr. 12 College English

    I can't seem to figure out the tone of the narrator in "The Lottery Ticket", and how it is established.
  3. Algebra

    Hi, how would I solve these 2 equations using algebra?
  4. Algebra

    Solve by elimination method. 5x+y=1 10x+12y=2 Please Help I can't seem to figure this one out.
  5. Algebra

    Solve by elimination method. 5x+y=1 10x+12y=2 Please Help I can't seem to figure this one out.
  6. algebra

    well i'm stumped. i can't figure out how to solve this. solve for (x,y): 3/x + 2/y = 0 5/x - 1/y = 13 i can't graph it, and i can't use a calculator. i keep getting stuck on the second equation b/c i get 5y -13xy -x=0 and since 13 …
  7. College Algebra

    Solve the following equation in the complex number system x^4+x^3+4x^2+10x-60=0 College Algebra - Reiny, Monday, January 2, 2012 at 11:49pm hint x = 2 and x = -3 are roots so either do long division by x-2 and x+3 to get a quadratic …
  8. Algebra 1

    I have been trying to figure out how to solve multi-step equations. Such as 1/2x+1/4x=16. How do you solve these?
  9. Math

    I might annoy you with this question but does any body know the question I posted below?
  10. Algebra

    5. Solve for x in the following system. 6x + 6y = -2 y = x I can't seem to figure this out, can someone give me some steps into solving this?

More Similar Questions