Algebra

Quadratic Formula

Using +/- for plus or minus
Using \/ radical sign

*****************_________
Formula: -b +/- \/b^2-4ac
********____________________

*****************2a

Equation:

x^2 - 25 = 0

Books says answer is 5 and -5. I can get the 5. I do not get the -5.

  1. 👍
  2. 👎
  3. 👁
  1. I don't understand.

    Didn't you post the formula with a +/- ?

    so in your equation x^2 - 25 = 0
    a = 1
    b = 0
    c = -25

    so x = (0 ±√(0-4(1)(-25))/2
    = ±√100 / 2
    = ±10/2
    = ±5

    of course the easier way would be to write the equation as
    x^2 = 25 , then
    x = ±√25 = ±5

    1. 👍
    2. 👎
  2. Yes I did post it with a +/- representing plus or minus the number.

    How were you about to show the +- with the minus sign uder the the plus sign?

    I looked at the answer you provided I think I can see my error. I was taking 0 for C not the 25. I remember now that C has to be a number without a variable next to it.

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. Chemistry

    the formula H2O2 is an example of 1.molecular formula 2. an empirical formula 3.an ionic formula 4.an organic formula

  2. algebra

    solve the equation or formula for the indicated variable R=ts^2+3 a)s=under radical R-3/t (not under radical b)s=everything under radical R-3/t c)s=R (under radical)-3/t d)s=everything under radical R/t-3 Thanks again I feel

  3. algebra

    Unit 4: Quadratic Functions and Equations Lesson 6: The Quadratic Formula and the Discriminant 1.) a=5, b=9, c=-4 2.) C 3.) No solution 4.) x=-2, x=1.25 5.) x=-9, x=3 6.) quadratic formula 7.) 2 8.) 11cm by 16cm

  4. Math

    a) Explain the relationship between the axis of symmetry and the quadratic formula. b) We know that the quadratic formula can be used to determine the roots of a quadratic function. However, the quadratic formula also reveals how

  1. Algebra

    Write a quadratic inequality whose solution is x < 3 or x > 7 I know the formula and everything, but I'm not sure where to move on from the inequality formula (x-a)(x-b)>0 Can someone please explain, am I supposed to use the

  2. Algebra

    1)Find the exact solutions to 3x^2=5x-1 using the quadratic formula. answer=5 plus or minus the square root of 37 over 6 2)Use the discriminant to determine the number and type of roots for the equation 2x^2-7x+9=0 answer=2

  3. math help

    write the quadratic equation whose roots are -4 and -5 and whose leading coefficient is 5 use the letter x to represent the variable. use the quadratic formula to solve for x 4x^2-9x+3=0

  4. Algebra

    Solve the equation. Use factoring or the quadratic formula, whichever is appropriate. Try factoring first. If you have any difficulty factoring, then go right to the quadratic formula. (Enter your answers as a comma-separated

  1. math help plsss plsss

    Decide which part of the quadratic formula tells you whether the quadratic equation can be solved by factoring. −b b^2 − 4ac 2a Use the part of the quadratic formula that you chose above and find its value, given the following

  2. algebra1

    what formula should i use to solve this quadratic formula? 2x2 + 4x + 2 = 0.

  3. i need help..algebra/math

    solve by using the quadratic formula: x2 plus x minus 2 equal 0 I know the formula is a=1 b=1 c=2 I'm having trouble solving...please help.

  4. Math

    Use the quadratic formula to solve each of the following quadratic equations... 1. 2x^2-5x=3 2. 3x^2-2x+1=0 Rearrange the equation in quadratic formula form. 2x^2 -5x -3 = 0 Then use the formula. Tell me what you don't understand

You can view more similar questions or ask a new question.