F(x)= 3x3 - 7 + 5x2i) F'(x)= 33x2 + 25xF'(x)= 9x2 + 10x ii) F''(x)= 2*9x + 10F''(x)= 18x + 10 iii) for maximum or minimum points (stationary points) F'(x)=0 9x2+ 10x = 0 x * (9x + 10) = 0 x = 0 or 9x + 10 = 0x = 0 or x = -10/9
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