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Posted by on Tuesday, October 4, 2011 at 10:56pm.

If f(x)=[(x−1)/(1+5x)], there are two points on the graph of
y=f(x) at which the tangent lines are parallel to the line x−2y=2.
Type in the x values of
these points. Type the smaller number first, then the larger number.

  • Calculus - , Wednesday, October 5, 2011 at 4:55am

    Sure, I'll type 'em in -- what are they?

    Oh, you mean I have to solve for them first? OK, here goes.

    The line x-2y=2 has slope 1/2

    f(x) has slope 10/(5x+1)^2 for all x ≠ -1/5

    SO, we have to find where the slope = 1/2

    10/(5x+1)^2 = 1/2

    20 = (5x+1)^2
    20 = 25x^2 + 10x + 1
    25x^2 + 10x - 19 = 0
    x = -1.09 or 0.69

    If you sketch the curve, you'll see that this appears correct.

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