Me ajudem trabalho valendo 46ponto
Anexos:
Soluções para a tarefa
Respondido por
1
A) x²+3=4x
x²-4x+3=0
a=1 b=-4 c=3
Δ (-4)² -4.1.3
Δ 16-12
Δ4
x=-(-4)+-√4
2.1
x=4+-2
2
x'=4-2 = 2 = 1
2 2
x''=4+2 = 6 =3
2 2
_______________________________
B) -20=-x-x²
x²+x-20=0
a=1 b=1 c=-20
Δ 1² - 4.1.(-20)
Δ1+80
Δ81
x= -(1)+-√81
2.1
x= -1+-9
2
x'=-1-9=-10=-5
2 2
x''=-1+9=8=4
2 2
________________________
C) 13-2x-15x²=0
15x²-2x-13=0
a=15 b=-2 c=-13
Δ(-2)² - 4.15.(-13)
Δ4+780
Δ784
x=-(-2)+-√784
2.15
x=2+-28
30
x'=2-28=-26=13
30 30 15
x''=2+28=30=1
30 30
______________________
D)4x²+7x+3=2x²+2x
4x²-2x²+7x-2x+3=0
2x²+5x+3=0
a=2 b=5 c=3
Δ5²- 4.2.3
Δ25-24
Δ1
x=-(5)+-√1
2.2
x=-5+-1
4
x'= -5-1=-6 =-3
2 2
x''=-5+1=4=2
2 2
________________
E)X(X-2)=2(x+6)
x²-2x=2x+12
x²-2x-2x-12=0
x²-4x-12=0
a=1 b=-4 c=-12
Δ (-4)-4.1.-12
Δ16+48
Δ64
x=-(-4)+-√64
2.1
x=4+-8
2
x'=4-8=-2= -1
2 2
x''=4+8=12=6
2 2
_________________
F)X(2X-1)+6=4(x+1)
2x²-1x+6=4x+4
2x²-1x-4x+6-4
2x²-5x+2=0
a=2 b=-5 c=2
Δ(-5)²-4.2.2
Δ25-16
Δ9
x=-(-5)+-√9
2.2
x=5+-3
4
x'=5-3=2=1
4 4 2
x''=5+3=8 =2
4 4
___________________
G)(x-1)(x-2)=6
x²-2x-1x+2-6=0
x²-3x-4=0
a=1 b=-3 c=-4
Δ(-3)²-4.1.-4
Δ9+16
Δ25
x=-(-3)+-√25
2.1
x=3+-5
2
x'=3-5=-2=-1
2 2
x''=3+5=8=4
2 2
__________________
H)(2x-3)(x-8)=34
2x²-16x-3x+24-34=0
2x²-19x-10=0
a=2 b=-19 c=-10
Δ(-19)²-4.2.(-10)
Δ361+80
Δ441
x=-(-19)+-√441
2.2
x=19+-21
4
x'=19-21=-2=-1
4 4 2
x''=19+21=40=10
4 4
_____________
PRONTO ESPERO TER AJUDADO
x²-4x+3=0
a=1 b=-4 c=3
Δ (-4)² -4.1.3
Δ 16-12
Δ4
x=-(-4)+-√4
2.1
x=4+-2
2
x'=4-2 = 2 = 1
2 2
x''=4+2 = 6 =3
2 2
_______________________________
B) -20=-x-x²
x²+x-20=0
a=1 b=1 c=-20
Δ 1² - 4.1.(-20)
Δ1+80
Δ81
x= -(1)+-√81
2.1
x= -1+-9
2
x'=-1-9=-10=-5
2 2
x''=-1+9=8=4
2 2
________________________
C) 13-2x-15x²=0
15x²-2x-13=0
a=15 b=-2 c=-13
Δ(-2)² - 4.15.(-13)
Δ4+780
Δ784
x=-(-2)+-√784
2.15
x=2+-28
30
x'=2-28=-26=13
30 30 15
x''=2+28=30=1
30 30
______________________
D)4x²+7x+3=2x²+2x
4x²-2x²+7x-2x+3=0
2x²+5x+3=0
a=2 b=5 c=3
Δ5²- 4.2.3
Δ25-24
Δ1
x=-(5)+-√1
2.2
x=-5+-1
4
x'= -5-1=-6 =-3
2 2
x''=-5+1=4=2
2 2
________________
E)X(X-2)=2(x+6)
x²-2x=2x+12
x²-2x-2x-12=0
x²-4x-12=0
a=1 b=-4 c=-12
Δ (-4)-4.1.-12
Δ16+48
Δ64
x=-(-4)+-√64
2.1
x=4+-8
2
x'=4-8=-2= -1
2 2
x''=4+8=12=6
2 2
_________________
F)X(2X-1)+6=4(x+1)
2x²-1x+6=4x+4
2x²-1x-4x+6-4
2x²-5x+2=0
a=2 b=-5 c=2
Δ(-5)²-4.2.2
Δ25-16
Δ9
x=-(-5)+-√9
2.2
x=5+-3
4
x'=5-3=2=1
4 4 2
x''=5+3=8 =2
4 4
___________________
G)(x-1)(x-2)=6
x²-2x-1x+2-6=0
x²-3x-4=0
a=1 b=-3 c=-4
Δ(-3)²-4.1.-4
Δ9+16
Δ25
x=-(-3)+-√25
2.1
x=3+-5
2
x'=3-5=-2=-1
2 2
x''=3+5=8=4
2 2
__________________
H)(2x-3)(x-8)=34
2x²-16x-3x+24-34=0
2x²-19x-10=0
a=2 b=-19 c=-10
Δ(-19)²-4.2.(-10)
Δ361+80
Δ441
x=-(-19)+-√441
2.2
x=19+-21
4
x'=19-21=-2=-1
4 4 2
x''=19+21=40=10
4 4
_____________
PRONTO ESPERO TER AJUDADO
brennolopes888:
preciso de todas pfv
Perguntas interessantes
Matemática,
9 meses atrás
Matemática,
9 meses atrás
Biologia,
9 meses atrás
Física,
1 ano atrás
Matemática,
1 ano atrás