[tex]f(x) = 5 {x}^{2} - 20x \\ \\ p = \frac{20}{10} = 2 \wedge p\notin <-2;1 > \\ \\ y_{max}=f( - 2) \\ y_{min}=f(1) \\ \\ f( - 2) = 5 \times 4 + 40 \\ \\ f( - 2) = 60 \\ \\ f(1) = 5 - 20 \\ \\ f(1) = - 15 \\ [/tex]
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[tex]f(x) = 5 {x}^{2} - 20x \\ \\ p = \frac{20}{10} = 2 \wedge p\notin <-2;1 > \\ \\ y_{max}=f( - 2) \\ y_{min}=f(1) \\ \\ f( - 2) = 5 \times 4 + 40 \\ \\ f( - 2) = 60 \\ \\ f(1) = 5 - 20 \\ \\ f(1) = - 15 \\ [/tex]