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Posted by on Thursday, October 13, 2011 at 9:10am.

One zero of f(x)=x^3+4x^2+x+c is -3.
a) calculate the value of c.
b)calculate the other zeros.

  • Grade 12 Advanced Functions - , Thursday, October 13, 2011 at 10:14am

    Ummm, didn't MathMate just do one of these for you? Plug in -3 and evaluate to find c.

  • Grade 12 Advanced Functions - , Thursday, October 13, 2011 at 10:43am

    Ummmmm, I needed help with the second part

  • Grade 12 Advanced Functions - , Thursday, October 13, 2011 at 10:48am

    Divide by x+3 and see what you get:

    x^3 + 4x^2 + x -6
    = (x+3)(x^2 + x - 2)
    = (x+3)(x+2)(x-1)

    Got it now?

  • Grade 12 Advanced Functions - , Thursday, October 13, 2011 at 6:09pm

    what about this question:
    Determine the roots algebraically by factoring.
    a) x^3-8x^2-3x+90=0

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