math

posted by .

how to complete the square for
-2x^2+3x-1?
can you plz help me, and any help is greatly appricieted.
thnx a lot for your effort.

  • math -

    step1
    always factor out the coefficient of the x^2 term, unless it is already 1
    this guarantees that it will be just x^2

    -2x^2+3x-1
    = -2[x^2 - 3/2 + ...] - 1
    now take 1/2 of the coefficient of the x term, square that result, and then add and subtract it

    1/2 of -3/2 is -3/4, which when squared is 9/16

    = -2[x^2 - 3/2 + 9/16 - 9/16] - 1

    your first 3 terms inside the bracket are your "perfect square"

    = -2[x - 3/4)^2 - 9/16] - 1
    now multiply through by the -2

    = -2(x - 3/4)^2 + 9/8 - 1

    simplify the end part

    = -2(x - 3/4)^2 + 9/8 - 8/8
    = -2(x - 3/4)^2 + 1/8

  • small typo math -

    the middle term should of course be (-3/2)x in two of the above lines.

    I am pretty sure you know where the typo error is.

  • math -

    r u there gagan

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Quadratic Equations

    Ok, I am supposed to find out what the variables are by factoring and finding square roots. I couldn't find the right factors of a and c that added up to b in the equation (did that make sense?
  2. math

    A highschool is planning to build a new playing field surrounded by a running track. The track coach wants two laps around the track to be 1000m. The football coach wants the rectangular infield area to be as large as possible. Can …
  3. math

    Simplify ã12+ã18-ã27+ã50 thnx a lot any help is greatly appriceted....
  4. math (grade 11 operations with radicals)

    Simplify sqrt12 + sqrt18 - sqrt27 + sqrt 50 thnx a lot any help is greatly appriceted.... these are grade 11 radical expressions and the answer for this is : - -sqrt3 + 8sqrt2
  5. US HISTORY PLZ ANSWER MY QUESTION

    name 1 person that was influential to delaware when it was first founded. plz n thnx!
  6. math

    what is a sixth grade divison problem with the number 17 in it plz help working on this since 8:15AM thnx u
  7. My Grades

    Great News today I got my report card my average is 93.50 eng 7 99 outstanding effort good wk habits good partictipation math 7 91 outstanding effort enthusiatic learner good partictipation pleasure to have in sci 7R 80 satisfactory …
  8. Mathematics

    A lot which is 3 feet times as long as it is wide is enclosed by a walk 10 feet wide. The area of the lot is 1200 square feet more than that of the walk. Find the dimensions of the lot. PLZ help and give a check if possible!
  9. Math

    The side of the square lot is (5x-3) meters. How many meters of fencing materials are needed to enclose the square lot?
  10. HELP plz

    A business owner wants to have a rectangular parking lot resurfaced. The lot is 93 feet long by 58 feet wide. Basesd on a cost of $2.47 per square foot, the owner incorrectly estimated that it would cost $12,000 to have the lot resurfaced. …

More Similar Questions