[tex]f(x) = - 3 {x}^{2} + 9x - 4 \\ f'(x) = 2 \times ( - 3 {x}^{2 - 1} ) + 9 {x}^{1 - 1} = - 6x + 9 \\ f'(x) = 0 \\ - 6x + 9 = 0 \\ 6x = 9 \\ x = \frac{9}{6} \\ x = \frac{3}{2} \\ x = 1.5 \\ + + + [1.5] - - - \\ x_{max} = 1.5[/tex]
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[tex]f(x) = - 3 {x}^{2} + 9x - 4 \\ f'(x) = 2 \times ( - 3 {x}^{2 - 1} ) + 9 {x}^{1 - 1} = - 6x + 9 \\ f'(x) = 0 \\ - 6x + 9 = 0 \\ 6x = 9 \\ x = \frac{9}{6} \\ x = \frac{3}{2} \\ x = 1.5 \\ + + + [1.5] - - - \\ x_{max} = 1.5[/tex]