Math (Algebra)

posted by .

One root of the quadratic equation x^2 − 2x + m = 0 is 9. If the other root is n, what is n−m?

  • Math (Algebra) -

    x^2-2x+m = (x-9)(x-n)
    so,
    -2 = -(n+9)
    m = 9n

    n = -7
    m = -63

    m+n = -70

  • Math (Algebra) -

    thanks a lot steve

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Algebra

    Use the quadratic formula to solve the equation. Give exact answers: 2x^2 -1 = 6x. The choices are: a) -3 + square root(7)/2, -3 - square root(7)/2 b) 3 + square root(11)/2, 3 - square root(11)/2 c) 3 + square root(7)/2, 3 - square …
  2. algebra

    Hello, I need help answering a regents question. It is asking me to find the root of an equation. It also includes a graph which I am unable to upload.The equation is y = −x2 − 2x + 8. -Thank You
  3. calculus

    Find an equation for the surface consisting of all points P(x, y, z) equidistant from the point P(0, 1, 0) and the plane x = 3. Answer Choices: 1. y2 + z2 − 6x + 2y − 8 = 0 2. x2 + z2 + 6y − 2z − 8 = 0 3. y2 …
  4. Trigonometry

    Given the rectangular-form point (–1, 4), which of the following is an approximate primary representation in polar form?
  5. biology

    Given the part of the molecule shown below, can the underlined atom participate in a hydrogen bond with an approriate bonding partner?
  6. Math (Algebra)

    If a is a real number and a cubic equation f(x) = x^3 − 8x^2 + (a+12)x − 2a has a repeated root, what is the sum of all the possible values of a?
  7. MATHS

    The number 2+3√+5√−−−−−−−−−−√ is algebraic because it is a root of a monic polynomial of degree 8, namely x^8+ax^7+bx^6+cx^5+dx^4+ex^3+fx^2+g^x+h. Find |a|+|b|+|c|+|d|+|e|+|f|+|g|+|h|.
  8. Calculus 1

    Use Newton's method to approximate the indicated root of the equation correct to six decimal places. The root of x^4 − 2x^3 + 5x^2 − 5 = 0 in the interval [1, 2]
  9. Algebra

    If x=16 is one of the root of the quadratic equation x square-2(7x+16)=0,find the other root.
  10. math

    if one root of the quadratic equation is 3+2root2 then what will be the other root?

More Similar Questions