Question

Resolva as equações do 2°grau a seguir

a)x²-2x=0
b)x²-3x=0
c)x²-16=0
d)x²-25=0​

Answer 1

Resposta:

a) x(x-2)=0

x1=0 x2=2

b) x(x-3)=0

x1=0 x2=3

c) x=$\sqrt{16}$

x1=4 x2=(-4)

d) x=$\sqrt{25}$

x1=5 x2=(-5)

Answer 2

a) x²-2x=0

x(x-2)=0

x'=0

x-2=0

x"=2

S={0,2}

b)x²-3x=0

x(x-3)=0

x'=0

x-3=0

x=3

S={0,3}

c)x²-16=0

x²=16

√x²=√16

x=+-16

S={-16,16}

d)x²-25=0

x²=25

√x²=√25

x=+-25

S={-25,25}