Question: B. NO calculator Consider the function f(x) = x +4x on the interval 8 x 8. (a) Find the coordinates of all points at

B. NO calculator Consider the function f(x) = x +4x on the interval 8 x 8. (a) Find the coordinates of all points at which the tangent to the curve is a horizontal line. (b) Find the coordinates of all points at which the tangent to the curve is a vertical line. (c) Find the coordinates of the points at which the absolute maximum and absolute minimum occur. (d) For what values of x is this function concave down? 1/3-- = -2/3

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