Explicação passo-a-passo:
x²+4x -5=0
∆= 4² -4.1.(-5)
∆= 16 + 20
∆= 36
x = - 4 ±√36/2.1
x= -4 ±6/2
x1= -4 +6/2= 2/2 =1
x2= -4-6/2= -10/2= -5
S = { -5 , 1}
2x² -9x +4=0
∆= (-9)² - 4.2.4
∆= 81 - 32
∆= 49
x = - (-9) ±√49/2.2
x= +9 ±7/4
x1= 9+7/4= 16/4= 4
x2= 9-7/4= 2/4= 1/2
S= { 1/2, 4 }
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Explicação passo-a-passo:
x²+4x -5=0
∆= 4² -4.1.(-5)
∆= 16 + 20
∆= 36
x = - 4 ±√36/2.1
x= -4 ±6/2
x1= -4 +6/2= 2/2 =1
x2= -4-6/2= -10/2= -5
S = { -5 , 1}
2x² -9x +4=0
∆= (-9)² - 4.2.4
∆= 81 - 32
∆= 49
x = - (-9) ±√49/2.2
x= +9 ±7/4
x1= 9+7/4= 16/4= 4
x2= 9-7/4= 2/4= 1/2
S= { 1/2, 4 }