Question

Resolva as equações do 2 grau incompleta a) 4x2 - 36 igual 0 b) 7 x2 - 21 igual 0 c) 10 x2 - 40 igual 0 d) 4x2 - 100x igual 0

Answer 1

Explicação passo-a-passo:

a) 4x² - 36=0

4x² = 36

x² = 36/4

x²= 9

x= ±√9

x= ±3

S={-3,+3}

b) 7x² - 21=0

7x²=21

x²= 21/7

x²= 3

x= ±√3

S= { -√3, +√3}

c) 10x² -40=0

x² = 40/10

x²= 4

x= ±√4

x= ±2

S={-2,+2}

d) 4x² - 100x= 0

4x ( x - 25)=0

4x=0

x=0/4

x1=0

x-25=0

x2= +25

S= { 0, 25}