1) Calcule as seguintes equações do 2° grau
A) 2x²-4x+4=0
B)3x²-10x+8=0
C)X²+7x+8=0
D)X²-7x+8=0
E)-2x+4x+1=0
F)x²-2×-8=0
G)2ײ-3×+5=0
H)ײ-4+3=0
I)ײ+8×+15=0
J)ײ+16×+64=0
É URGENTE!
Soluções para a tarefa
Resposta:
a)2x²-4x+4=0
a=2 b=-4 c=4
Δ=b²-4ac
Δ=(-4)²-4·2·4
Δ=16-32
Δ=-16
S=∅
b)3x²-10x+8=0
a=3 b=-10 c=8
Δ=b²-4ac
Δ=(-10)²-4·3·8
Δ=100-96
Δ=4
x=-b±√4/2a
x=10±2/6
x'=12/6÷2= 6/3
x"=8/6÷2= 4/3
S= 6/3, 4/3
c)x²+7x+8=0
a=1 b=7 c=8
Δ=b²-4ac
Δ=7²-4·1·8
Δ=49-32
Δ=17
x=-b±√17/2a
x=-7±√17/2
x'=√10/2=√-5
x"=√24/2=√12
S= √-5, √12
d)x²-7x+8=0
a=1 b=-7 c=8
Δ=b²-4ac
Δ=(-7)²-4·1·8
Δ=49-32
Δ=17
x=-b±√17/2a
x=7±√17/2
x'=√10/2=√5
x"=√24/2=√12
S= √5, √12
e)-2x+4x+1=0
a=-2 b=4 c=1
Δ=b²-4ac
Δ=4²-4·(-2)·1
Δ=16+8
Δ=24
x=-b±√24/2a
x=-4±√24/4
x'=√20÷4= √-5
x"=√28÷4= √7
S= √-5, √7
f)x²-2x-8=0
a=1 b=-2 c=-8
Δ=b²-4ac
Δ=(-2)²-4·1·(-8)
Δ=4+32
Δ=36
x=-b±√36/2a
x=8±6/2
x'=2÷2=1
x"=14÷2=7
S= 1,7
g)2x²-3x+5=0
a=2 b=-3 c=5
Δ=b²-4ac
Δ=(-3)²-4·2·5
Δ=9-40
Δ=-31
S=∅
h)x²-4+3=0
a=1 b=-4 c=3
Δ=b²-4ac
Δ=(-4)²-4·1·3
Δ=16-12
Δ=4
x=-b±√4/2a
x=4±2/2
x'=2÷2=1
x"=6÷2=3
S= 1,3
i)x²+8x+15=0
a=1 b=8 c=15
Δ=b²-4ac
Δ=8²-4·1·15
Δ=64-60
Δ=4
x=-b±√4/2a
x=-8±2/2
x'=-10÷2=-5
x"-6÷2=-3
S= -5,-3
j)x²+16x+64=0
a=1 b=16 c=64
Δ=b²-4ac
Δ=16²-4·1·64
Δ=4096-256
Δ=3840
x=-b±√3840/2a
x=-16±√3840/2
x'=√3856÷2= √1928
x"=√3824÷2= √1912
S= √1928, √1912
Explicação passo a passo:
faz como bem entender :)