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Math Help - Solve for x and y. Includes logs, trigonometric eqns, and simultaneous equations.

  1. #1
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    Solve for x and y. Includes logs, trigonometric eqns, and simultaneous equations.





    For the problem below, I only need help on expalnation for part b.
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  2. #2
    MHF Contributor alexmahone's Avatar
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    For the first problem, graph the 2 equations. It is then easy to see that there are 2 solutions: one negative and one positive.

    For the second problem, take logarithms on both sides
    (x+2)ln 3=(2x-1)ln 5
    \frac{x+2}{2x-1}=\frac{ln 5}{ln 3}

    For part b),
    i) (f+g)(0)=f(0)+g(0)=2+1=3
    ii) (fg)(0)=f(0)g(0)=2*1=2
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  3. #3
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    Quote Originally Posted by delicate_tears View Post
    For the problem below, I only need help on expalnation for part b.
    You've found the "rules" in part (a). Now plug zero in for "x" in those rules.
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