Math

posted by .

solve c(x)=x^2-40x+405

  • Math -

    C(x) = x^2 - 40x + 405 = 0,
    Use the Quadratic Formula:

    x = ( 40 +- sqrt(400-1620)) / 2,
    x = (40 +- sqrt(-20)) / 2,
    x = (40 +- sqrt(20*-1)) / 2,
    x = (40 +- 4.47i) / 2,

    Solution Set:
    x = 20 + 2.24i.
    x = 20 - 2.24i.

  • Math -

    Correction:Replace 400 with 1600.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. HELP ME

    Find two numbers whose difference is 42adn product s -405 Find two numbers whose difference is 42 and product is -405 Set up 2 equations and 2 unknowns. x - y = 42 xy = -405 Then rearrange the second so y = -405/x, and substitute this …
  2. Algebra 2

    Posted by Christian on Monday, May 7, 2007 at 11:34am. The area of a rectangular blanket in square centimeters is 40x^2+2x-65. The width is 4x-5 cm^2. Find the dimensions of the blanket in terms of x. For Further Reading Algebra 2 …
  3. Liberal Arts Math

    factor the polynomial completely: 2xy-3y-40x+60 2xy-40x-3y+60 2x(y-20)-3(y-20) (2x-3)(y-20)
  4. Physics

    A block oscillates on a spring and passes its equilibrium position with a speed of .157m/s. It's kinetic energy is zero when the block is at the distance of .1m from equilibrium. Assume no friction between the block and the table. …
  5. Math-Factoring 2

    Factor Completely 2x^3-40x^2-192x I have a common factor of x so I rewrote the problem as x(x^2-40x+192) then trying to use FOIL rewrote as (x ) (x ) And that is where i'm stuck.
  6. math

    question is 40x^2 + 23x -30 = 0 reads as 40x squared plus 23x minus 30 equals zero...please help, we have not learned the quadric formula yet so we are finding the numbers that make 30 and add to 23.
  7. math

    solve using set builder notation -8-11(3x+7)less than or equal to -40x-9
  8. Math

    solve c(x)=x^2-40x+405 where x equals 15
  9. Math

    Solve for 5 X 3 to the nth,. my answer is 15, 45, 135, 405
  10. Tricky Math tho (Damon)

    Divide. (25x^2 - 40x + 18) div. (5x - 3) need to know how to solve this

More Similar Questions