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Function composition

  1. Nov 12, 2009 #1
    1. The problem statement, all variables and given/known data

    (-3x^2-15x-12)(√5)

    2. Relevant equations

    Quadratic formula?

    3. The attempt at a solution
    hmm, i know how to solve the first set of bracets, but what do i do with the radical? how do i multiply it to the polynomial?
     
  2. jcsd
  3. Nov 12, 2009 #2
    all you have to do is multiply it to the two solutions
    so say the factored quadratic is (x-4)(x+4), so the solutions are 4 and -4. just multiply the rad5 to those two answers.
     
  4. Nov 12, 2009 #3

    Mark44

    Staff: Mentor

    What are you trying to do here? About all you can do with what you've provided is factor the quadratic or multiply the quadratic by sqrt(5). You are not "solving" the first set of brackets - to solve an equation you first off need an equation, which you don't have.
     
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