Question

6)Resolva as equações considerando U=|R

A) x²+7x=0
B) m²-5m=0
C) 3y²-18y=0
D) 2x²-9x=0
E) x²=x
F) 4x²=-3x

Answer 1

a)x(x+7)=0
x1=0 e x2=-7

b) m(m-5)=0. m1=0 e m2=+5

c) 3y(y-6)= 0 y1=0 e y2=+6

d) ∆=(-9)²-4.2.0
∆=81-0
∆=81
x=9+-√81/2.2
x1=9+9/4= 18/4=9/2
x2=9-9/4=0/4=0

e)x²-x=0
x(x-1)=0
x1=0 e x2=+1

f)+4x²+3x=0
∆=(3)²-4.4.0
∆=9-0
∆=9
x= -3+-√9/2.4
x1= -3+3/8=0/8=0
x2= -3-3/8= -6/8= -3/4