find the x coordinate of all the points on the parabola y=x^2 where the tangent lines pass through the point (1,-3)
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Originally Posted by valvan find the x coordinate of all the points on the parabola y=x^2 where the tangent lines pass through the point (1,-3) The derivative function is so, slope at point (a, a^2) is going to be 2a. The slope of the tangent line can also be measured as rise over run between the points (a, a^2) and (1, -3). Set this equal to 2a and solve for a. Good luck!!
ok thanks i got x= -1 and 3
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