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Math Help - Two quadratic problems...

  1. #1
    M23
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    Two quadratic problems...

    The x-intercepts of the graph of a quadratic function are -2 and 3. What is the equation of the axis of symmetry? A. x = 0.5 B. x = 1.0 C. x = -0.5 D. x = -1.0 .................................................. .................................................. .................................................. ...................2. The hypotenuse of a right triangle is 34 cm in length. One leg of the triangle is 14 cm longer than the other leg. If the length of the shorter leg is represented by x, a quadratic equation that can be used to determine the lengths of the legs is A. x2 + 14x - 480 = 0 B. x2 + 14x - 676 = 0 C. x2 - 14x - 480 = 0 D. x2 - 14x - 676 = 0 I've tried getting the answer, but it does not seem to match up with the choices. Thanks for the help!
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  2. #2
    Member SENTINEL4's Avatar
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    Quote Originally Posted by M23 View Post
    The hypotenuse of a right triangle is 34 cm in length. One leg of the triangle is 14 cm longer than the other leg. If the length of the shorter leg is represented by x, a quadratic equation that can be used to determine the lengths of the legs is A. x2 + 14x - 480 = 0 B. x2 + 14x - 676 = 0 C. x2 - 14x - 480 = 0 D. x2 - 14x - 676 = 0
    If one side is 14 cm longer than the shorter then you have :
    shorter = x so the other x+14

    Use Pythagoras Theorem and you have

    x^2 + (x+14)^2 = 34^2 \Rightarrow ... \Rightarrow x^2+14x-480=0
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  3. #3
    A riddle wrapped in an enigma
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    Quote Originally Posted by M23 View Post
    The x-intercepts of the graph of a quadratic function are -2 and 3. What is the equation of the axis of symmetry?
    A. x = 0.5
    B. x = 1.0
    C. x = -0.5
    D. x = -1.0
    The axis of symmetry will pass through the midpoint of the x-intercepts. What is halfway between -2 and 3?
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