Question

me ajudem pfv e aque mais vale da prova ​

Answer 1

Resposta:

a) x= -0,5 e 4

b) x= 2 e -3

c) x= 2 e -4

d) x= 1 e 3

Explicação passo-a-passo:

a)

-2x²+3x+2=0

∆=3²-4.(-2).2

∆=9+8.2

∆=9+16

∆=25

x'=-3+√25/2.-2=-3+5/-4=2/-4=-1/2=-0,5

x"=-3-5/2.-2=-8/-2=4

b)

x²+x-6=0

∆=1²-4.1.(-6)

∆=1+24

∆=25

x'=-1+√25/2.1=-1+5/2=4/2=2

x"=-1-5/2.1=-6/2=-3

c)

x²+2x-8=0

∆=2²-4.1.(-8)

∆=4+32

∆=36

x'=-2+√36/2.1=-2+6/2=4/2=2

x"=-2-6/2.1=-8/2=-4

d)

-x²+4x-3=0

∆=4²-4.(-1).(-3)

∆=16+4.(-3)

∆=16-12

∆=4

x'=-4+√4/2.(-1)=-4+2/-2=-2/-2=1

x"=-4-2/-2=-6/-2=3