Question

esboce o grafico f(x)=-X²+3X+4

Answer 1

segue anexo o grafico e tabela de valores ok 

Answer 2

$- x^{2} +3x + 4=0 \\ \Delta= 3^{2} -4. (-1).4 \\ \Delta=9+16 \\ \Delta=25 \\ x= \frac{-3\pm \sqrt{25} }{2. (-1)} \\ \\ x= \frac{-3\pm5}{-2} \\ \\ x^{'} = \frac{-3+5}{-2} = \frac{2}{-2} =-1 \\ \\ x^{"} = \frac{-3-5}{-2} = \frac{-8}{-2} =4 \\ \\ x_{v} = \frac{-3}{2.(-1)} = \frac{3}{2} ~~~~~ y_{v} = \frac{-25}{4. (-1)} = \frac{25}{4} \\ \\ (-1;0),(4;0)( \frac{3}{2}; \frac{25}{4} ),(0;4)$