Question

resolva a equação
x^3-19x^2+90x=0

Answer 1

4x³ -19x² +28x +m = 0  

x+y+z = -b/a  

x+2+2 = 19/4  

x = 19/4 -4 = 19/4 -16/4 = 3/4 ( a outra raiz)  

x .y.z = -d/a  

3/4 .2.2 = -m/4  

3/4. 4 = -m/4  

3 = -m/4  

m = -12