Question

Preciso urgente pfvr

Answer 1

Explicação passo-a-passo:

x.x - 14 = 5x

x² -5x -14=0

∆= (-5)² -4.1.(-14)

∆= 25 + 56

∆= 81

x= - (-5) ±√81/2.1

x= +5 ±9/2

x1= 5+9/2=14/2=7

x2= 5-9/2= -4/2= -2

S = { - 2, 7}