Explanation:
Find equation of the parabola to be - 1/4 ( x-3)^2 -1
expanded this = y= - 1/4 x^2 + 6/4 x- 13/4
derivative of this is - 1/2 x + 6/4
set this equal to the desired slope (1/2)
- 1/2 x + 6/4 = 1/2
- 1/2 x = -1
x = 2
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