math-calculus

posted by .

the roots of the equation |x^2+2x-10| = 5 are -5, 3, and -1+-sqrtN

value of N is?
A. 6
B. 8
C. 12
D. 24

please help with this.

  • math-calculus -

    x^2+2x-10=5 or x^2+2x-10=-5
    x^2+2x-15=0 or x^2+2x-5 = 0
    (x+5)(x-3) or [ -2 +/- sqrt(4+20)]/2
    = [ -2 +/- sqrt (4*6)] /2
    = -1 +/- sqrt(6)

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. math

    The roots of the eqn x^4 - 3x^2 + 5x - 2 = 0 are a, b, c, d, and a^n + b^n + c^n + d^n is denoted by S~n. The equation of the roots a^2, b^2, c^2, d^2 is y^4 - 6y^3 + 5y^2 - 13y + 4 = 0. State the value of S~2 and hence show that S~8 …
  2. Pre-Calculus/Trig Check please and help

    Could someone please check the first one and help me with the second one. I'm stuck-Thank you 1.What are theroots of the following polynomial equation?
  3. Algebra help plz

    If € , ß are the roots of the equation 2x^2 + 4x - 3 = 0 and €^2 , ß^2 are the roots of the equation x^2 + px + q = 0, find the value of p.
  4. Calculus

    1. Use the Mean Value Theorem to find an x-value where the instantaneous slope=average slope over the given interval: f(x)=(9-x^2)^(1/2) on [-3,2] I have done three chapters of Calculus already and I never have had to check for extraneous …
  5. Math

    determine the value(s) of k which the equation x^2+kx+9=0 will have a) two real roots b) 2 distinct roots I tried to find the discriminant but I didn't get the right answer.
  6. Math

    determine the value(s) of k which a quadratic equation x^2+kx+9=0 will have. a) two equal real roots b) 2 distinct roots I tried to find the discriminant but couldn't get the right answer
  7. Math

    Help. If p and q are the roots of the equation 2x^2-x-4=0. Find the equation whose roots are p-(q/p) and q-(p/q). Working please
  8. Math

    Given that the equation x(x-2p)=q(x-p) has real roots for all real values of p and q. If q=3, find a non-zero value for p so that the roots are rational.
  9. Math, factoring

    Two of the roots of x^4 +ax^3 +ax^2+11x+b=0 are 3 and -2. 1. Find the value of a and b 2. Find the other roots. I believe that a = -3 and b = -6. I am unsure of how to find the other roots. Please show how you found the answer.
  10. Math

    If one root of the equation x^2-px+20=0 is 4,while the equation x^2-qx+p has equal roots, then possible value of q is. A)3. B)4. C)5. D)6. I think 6 is correct. Please check it.

More Similar Questions