Question

Resolver as seguintes equações em IR
A)X²-6+5=0
B)2X²-7X+5=0
C)X²-4X+4=0
D)3X²-6X=0
E)X²-9=0

Answer 1

a). x^2 -1=0
x^2=1
x=√1
x=+-1
b) 2x^2 -7x+5=0
x^2-7x+10=0
x' +x''=7
x'.x''=10
x'=5/2
x''=2/2=1
c)x^2-4x+4
x'+x''=4
x'.x''=4
x'=2
d)3x^2-6x=0
x(3x-6)=0
x'=0
3x''-6=0
x"=2
e)x^2-9=0
x^2=9
x=√9
x'=3
x"=-3