Question

resolva as equacoes do 2 grau do tipo ax^2+bx=0

A) x^2+5x=0

B)2x^2-10x=0

C)2x^2+4x=0

D)6x^2-5x=0

E)3x^2+6x=0

F)x^2-4x=0

Answer 1

a)ײ+5×=0

∆=25-0

∆=25

×=-5±5/2

×'=0

×"=-10/2=-5

S={0;-5}

b)2ײ-10×=0

∆=100

×=10±10/4

×'=20/4=5

×"=0

S={5;0}

c)2ײ+4×=0

∆=16

×=-4±4/4

×'=0

×"=-8/4=-2

S={0;-2}

d)6ײ-5×=0

∆=25

×=5±5/12

÷'=10/12=5/6

×"=0

S={5/6;0}

e)3ײ+6×=0

∆=36

×=-6±6/6

×'=0

×"=-12/6=-2

S={0;-2}

f)ײ-4×=0

∆=16

×=4±4/2

×'=8/2=4

×"=0

S={4;0}