algebra

posted by .

Select the approximate values of x that are solutions to f(x)=0, where f(x) = -2x^2+8x+5

  • algebra -

    so
    -2x^2 + 8x + 5 = 0
    x^2 - 4x = 5/2
    complete the square ...
    x^2 - 4x + 4 = 5/2 + 4
    (x-2)^2 = 13/2 = 26/4
    x-2 = √26/4 ........ since √26 is close to 5
    x = appr 2 ± 5/2
    = appr 4.5 or .5

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. algebra

    Select the approximate values of x that are solutions to f(x) = 0, where f(x) = -9x2 + 2x + 6. a) {-0.71, 0.94} b) {-9,2} c) {-0.22, -0.67} d) {-1.50, 0.33}
  2. Math Quadratic Equations

    1. Which of the following conclusions is true about the statement below ?
  3. Math help please!!!

    1. Determine the equation of g (x) that results from translating the function f(x)=x^2+5 upward 8 units. A. g (x)= (x +13)^2 B. g (x)= ( x+8 )^2 +5 C. g (x)= x^2 -3 D. g (x)= x^2+13 I think (D.) is my answer please check over for me. …
  4. math

    select the approximate values of x that are solutions to f(x)=0 where f(x)-5x^2+8+5
  5. Algebra

    Hello, I hope all is well. I am hoping you can help. Select the approximate values of x that are solutions to f(x) = 0, where f(x) = -7x^2 + 6x + 3.
  6. Algebra

    Hello, This one as well. Thank you! Select the approximate values of x that are solutions to f(x) = 0, where f(x) = -8x^2 + 3x + 9.
  7. Math

    Select the approximate values of x that are solutions to f(x) = 0, where f(x) = -3x^2 + 9x + 3.
  8. algebra

    Select the approximate values of x that are solutions to f(x) = 0, where f(x) = -3x2 + 6x + 9
  9. Algerbra

    select the approximate values of x that are solutions to f(x) = 0, where f(x) = -8^2 + 2x + 2
  10. algebra

    Select the approximate values of x that are solutions to f(x) = 0, where f(x) = -8x2 + 7x + 6.

More Similar Questions