College Algebra

I'm sorry I wrote the problem wrong previously.

"The equation x^2-9x-1=0 has 2 solutions A and B. Where A < B.
x^2-9x-1=0
(x-9)x=1
x^2=9x+1
(x-9/2)^2-85/4=0

Solutions x=1/2(9- sq root 85)
and x=1/2(9 + sq root 85)

I also have a second similar problem. 2x^2+17x+2=0
x(2x +17)+2=0
16/273(x+17/4)^2=1
2(x+17/4)^2-273/8=0
Solutions x=1/4(-17- sq root 273)
or x=1/4(sq root 273-17)

Both these answers we marked wrong on my homework. Please help me

  1. 👍 0
  2. 👎 0
  3. 👁 132
  1. x^2-9x-1 = 0
    x^2-9x = 1
    x^2 - 9x + 81/4 = 1 + 81/4
    (x - 9/2)^2 = 85/4
    x - 9/2 = ±√85/2
    x = 9/2 ±√85/2
    = 1/2 (9±√85)

    2x^2+17x+2 = 0
    2x^2+17x = -2
    2(x^2+17/2 x) = -1
    x^2 + 17/2 + 289/16 = -1 + 289/16
    (x + 17/4)^2 = 273/16
    x + 17/4 = ±√273/4
    x = -17/4 ±√273/4
    = 1/4 (-17±√273)

    1. 👍 0
    2. 👎 0
    posted by Steve

Respond to this Question

First Name

Your Response

Similar Questions

  1. Math

    I posted this problem the other day and someone answered it but when I checked my book I realized that I wrote the problem wrong. This morning when I posted I had put the wrong answer. The answer is suppose to be 1/8 but I don't

    asked by Josh on January 23, 2010
  2. Pre-Cal:(Cont.)

    [Note: I've tried this problem 4 times already and still have it wrong. I know the steps to doing it but for some reason its wrong. an someone please help me get these answers for (b).] An equation is given. (Enter your answers as

    asked by Amber on July 11, 2016
  3. Maths

    By making the substitution u =ln x show that the following equation has exactly one real-number solution: 9/ln x + ln x^4 =-12 Sorry wrote the incorrect equation previously!

    asked by Lauren on October 27, 2016
  4. algerba

    What is the value of the discriminant, b2 − 4ac, for the quadratic equation 0 = −2x2 − 3x + 8, and what does it mean about the number of real solutions the equation has? What are the solutions to the quadratic equation 4(x +

    asked by chelsie on May 25, 2016
  5. math

    Can someone please help me with my previous question? I'm not sure what window to use for the equation I previously wrote.

    asked by Mariah on March 16, 2008
  1. Math

    sorry I wrote problem wrong: Which equation would you use to find out if the two lines in the graph are parallel:(a)(1,4) and (-1,1) (b) (3,3) and (-1,-1) a. 4-1/-2-1 = 3-1/3-1 b. 4-1/-2-1 = 3-(-1)/3-1 c. 4-1/1-(-2)= 3-(-1)/3-(-1)

    asked by BUBBLES on February 3, 2015
  2. math, correction plz

    Can someone correct these for me.PLZ Problem#1 Directions solve equation ãx+4 = 3 My answer: x = 5 Probelm #2 Directions solve equation ã(4x+1) + 3 = 0 My answer x = 2 Problem #3 Directions solve equation ã(2y+7)+4=y My

    asked by jas20 on March 24, 2007
  3. CountIblis, can i bother you

    Countiblis, i know that you might be busy do you mind if i ask you the following for help.Only if you can please. can you explain to me just one more thing so i can undestand it. Now i have an equation which is : 3x = 3x + 5 which

    asked by jasmine20 on January 3, 2007
  4. Algebra

    1.Mary is selling her craft to earn money she sells her bracelets for $6 and her necklaces for $10 her goal is to make at least $120 in sales which of the following represents three possible solutions to the problem A.6x+10y=120

    asked by GummyBears on December 10, 2015
  5. Algebra

    1.Mary is selling her craft to earn money she sells her bracelets for $6 and her necklaces for $10 her goal is to make at least $120 in sales which of the following represents three possible solutions to the problem A.6x+10y=120

    asked by GummyBears on December 10, 2015

More Similar Questions