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Math Help - how do you find the equation of a secant???

  1. #1
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    how do you find the equation of a secant???

    Given the curve F(x)=x^2-3x+7. If A is the point where x=3 and B is the point where x=5, find the equation of the secant AB.
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  2. #2
    Rhymes with Orange Chris L T521's Avatar
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    Quote Originally Posted by deej813 View Post
    Given the curve F(x)=x^2-3x+7. If A is the point where x=3 and B is the point where x=5, find the equation of the secant AB.
    Can you find the equation of a line that passes through the points (3,7) and (5,17)?
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  3. #3
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    yeah
    i got the gradient as 5
    then the equation using the y-y1=m(x-x1)
    as 5x-y-8=0
    but the answer says 7x-2y-1=0
    what did i do wrong??
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  4. #4
    Rhymes with Orange Chris L T521's Avatar
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    Quote Originally Posted by deej813 View Post
    yeah
    i got the gradient as 5
    then the equation using the y-y1=m(x-x1)
    as 5x-y-8=0
    but the answer says 7x-2y-1=0
    what did i do wrong??
    The work is right, but either the function you posted is incorrect, or one (or both) of the A and B values are incorrect.
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  5. #5
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    ok well they are all right so maybe the answer is just wrong
    thanks heaps
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