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Math Help - Quadratic Function

  1. #1
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    Quadratic Function

    Please check the solution
    2x^2+3x-3=0

    x=(-3 plus/minus  \sqrt {33} )/4

    x=-2.185 and x=0.685

    Is this correct? Is there a better way to solve it?

    Thank you
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by oceanmd View Post
    Please check the solution
    2x^2+3x-3=0

    x=(-3 plus/minus  \sqrt {33} )/4

    x=-2.185 and x=0.685

    Is this correct? Is there a better way to solve it?

    Thank you
    it is x = -2.186 and x = 0.686
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  3. #3
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    Slope of Secant Line

    How to find the slope of the secant line for f(x) =2x^2-3x. Please solve it, as I have no idea how to do it.

    Thank you
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  4. #4
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by oceanmd View Post
    How to find the slope of the secant line for f(x) =2x^2-3x. Please solve it, as I have no idea how to do it.

    Thank you
    we need an interval here. the slope of the secant line between which points?
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  5. #5
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    I am doing the chapter review: a printout given by the teacher. It does not say between what points. Can you come up with the points and explain to me how to solve it.

    Thank you
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  6. #6
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by oceanmd View Post
    I am doing the chapter review: a printout given by the teacher. It does not say between what points. Can you come up with the points and explain to me how to solve it.

    Thank you
    ok, the slope of the secant line of a function f(x) between the points x = a and x = b is given by:

    \frac {f(b) - f(a)}{b - a}

    (this is just the formula for the slope of the straight line connecting the two points. note its similarity to \frac {y_2 - y_1}{x_2 - x_1})
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  7. #7
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    Ok, I will try
    The two points A(0.75, -9/8) which is the vertex of the parabola
    B (1.5,0), which is the x-intercept.
    The slope of the line is 3/2

    Is this correct?
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  8. #8
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by oceanmd View Post
    Ok, I will try
    The two points A(0.75, -9/8) which is the vertex of the parabola
    B (1.5,0), which is the x-intercept.
    The slope of the line is 3/2

    Is this correct?
    yes
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