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Functions - math

The function f is such that f(x)�
= 2x + 3 for x ≥ 0.
The function g is such that g(x)�= ax^2 + b for x ≤ q, where a, b and q are constants. The function fg is such that fg(x)�= 6x^2 − 21 for x ≤ q.
i)Find the values of a and b
ii) Find the greatest possible value of q.
It is now given that q = -3
iii) Find the range of fg
iv)Find the expression for inverse of (fg)(x) ad state the domain of the inverse of (fg)

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Desperately seeking help

  1. fg = (2x+3)(ax^2+b) = 6x^2-21
    2ax^3+3ax^2+bx+3b = 6x^2-21
    when x=q, we have

    2aq^3+3aq^2+bq+3b=6q^2-21
    2aq^3+(3a-6)q^2+bq+(3b-21) = 0

    check out the solutions to that at this url. The only easy one is in fact when q = -3.

    http://www.wolframalpha.com/input/?i=2aq%5E3%2B(3a-6)q%5E2%2Bbq%2B(3b-21)+%3D+0

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    Steve

  2. Thanks a lot Steve!!!

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    Desperately seeking help

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