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4xpatrat+5x-4 dati factor comun

Răspuns :

4x²+5x-4=0
x(4x+5)-4=0
x=0
4x+5-4=0
4x+1=0
4x=-1
x=-0.25
                          S={-0.25;0}
Sper ca te-am ajutat!

V=radical
DELTA=25+64=89
x1;2=(-5+/-V89)/8

4x^2+5x-4=4[x-(-5+V89)/8][x-(-5-V89)/8]=[2x+(5-V89)/4][2x+(5+V89)/4]