Test to see if the following functions are concave or convex at x = 2. (a) y

Test to see if the following functions are concave or convex at x = 2.

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(a) y = -4x +5x+3x-25 y=-12x+10x +3 y" = -24x + 10 y" (2) 24(2) + 10 = -3 -38 < 0 concave