Question

Find the real roots of x³ + x² + 3x + 4 =0.​

Answer 1

x³+x²+3x+4=0

x³+(x²+3x+4)=0

by middle term split

x³+(x²+4x-x+4)=0

x³+(x(x+4)-1(x+4))

x³+(x-1)(x+4)=0

x³=1 x³=4

x=1. x=³√4