Question

1. resolva as equações polinomiais do 2grau
a)x²-25=0

b)2x²-8=0

c)2x²-6x=0

d)x²-3x=0

e)x²-5x-24=0

f)-2x²+10x-8=0

Answer 1

a) x²-25=0
x²=25
x=±√25
x=±5
S={-5,5}

b) 2x²-8=0
2x²=8
x²=4
x=±√4
x=±2
S={-2,2}

c) 2x²-6x=0
2x(x-3)=0
x(x-3)=0
x=0
x-3=0
x=3
S={0,3}

d) x²-3x=0
x(x-3)=0
x=0
x-3=0
x=3
S={0,3}