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Thread: Quadratic function

  1. #1
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    Quadratic function

    Find expressions for the quadratic functions whose graphs are shown. So I got f(x)=3(x-5)^2 and g(x)=-7.5=a^2+b and they're both wrong so any help is appreciated.
    Quadratic function-3eca64dbb9e4d322d819a698ae30bc.gif
    Quadratic function-3eca64dbb9e4d322d819a698ae30bc.gif

    edit:Yes I've seen the other posts but don't know how to apply to these problems.
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  2. #2
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    Re: Quadratic function

    $$f(x)=2(x-5)^2$$

    since $f(6)=2$
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  3. #3
    Member Cervesa's Avatar
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    Re: Quadratic function



    $y=ax^2+bx+c$

    $11=a(-4)^2+b(-4)+c$

    $1=a(0)^2+b(0)+c$

    $-6.5=a(1)^2+b(1)+c$

    second equation simplifies to $c=1$

    solve the system of equations for the coefficients $a$ and $b$ formed by the other two equations.
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