Question

determine as raizes reais das equaçoes:

a)x2-25=0
b)x2-2x=0
c)2x2-200=0

Answer 1

Boa noite

a)

x² = 25

x1 = 5
x2 = -5

b)

x² - 2x = 0
x*(x - 2) = 0

x1 = 0
x2 = 2

c)

2x² = 200
x² = 100

x1 = 10
x2 = -10

Answer 2

Olá!

a)x2-25=0
=> x^2 = 25
=> x=+/- V25
=> x=+/- 5

S={-5; 5}

b)x2-2x=0
=> x(x-2)=0
=> x=0 V x=2

S={0; 2}

c)2x2-200=0
=> 2x^2 = 200

=> x^2 =200/2

=> x^2 = 100

=> x=+/- V100

=> x = +/- 10

S={-10; 10 }

Espero ter ajudado!