1)Resolva em IR.
A)

B)

C)

D)

E)

F)

G)

H)

i)

J)

K)

L)

M)

lelunardi1:
o que é IR?:???
Soluções para a tarefa
Respondido por
3
Boa tarde
de acordo com autor vou resolver F ate L
F)
-x² + 3x + 10 = 0
delta
d² = 9 + 40 = 49
d = 7
x1 = (-3 + 7)/-2 = -2
x2 = (-3 - 7)/-2 = 5
G)
y² + 8y - 4 = 0
delta
d² = 64 + 16 = 80 = 5*16
d = 4√5
y1 = (-8 + 4√5)/2 = -4 + 2√5
y2 = -4 - 2√5
H)
5x² + 3x + 5 = 0
delta
d² = 9 - 100
delta negativo nao tem raiz
I)
x*(x + 3) = 5x + 15
x² + 3x - 5x - 15 = 0
x² - 2x - 15 = 0
(x + 3)*(x - 5) = 0
x1 = -3
x2 = 5
J)
(3y + 1)/2 = (y² - 1)/3
9y + 3 = 2y² -2
2y² + 9y + 5 = 0
delta
d² = 81 - 40 = 41
d = √41
y1 = (-9 + √41)/4
y2 = (-9 - √41)/4
K)
(x + 4)² = 9x + 22
x² + 8x + 16 = 9x + 22
x² - x - 6 = 0
delta
d² = 1 + 24 = 25
d = 5
x1 = (1 + 5)/2 = 3
x2 = (1 - 5)/2 = -2
L)
(x - 1)² + 3x = x + 26
x² - 2x + 1 + 3x = x + 26
x² - 25 = 0
x1 = -5
x2 = +5
de acordo com autor vou resolver F ate L
F)
-x² + 3x + 10 = 0
delta
d² = 9 + 40 = 49
d = 7
x1 = (-3 + 7)/-2 = -2
x2 = (-3 - 7)/-2 = 5
G)
y² + 8y - 4 = 0
delta
d² = 64 + 16 = 80 = 5*16
d = 4√5
y1 = (-8 + 4√5)/2 = -4 + 2√5
y2 = -4 - 2√5
H)
5x² + 3x + 5 = 0
delta
d² = 9 - 100
delta negativo nao tem raiz
I)
x*(x + 3) = 5x + 15
x² + 3x - 5x - 15 = 0
x² - 2x - 15 = 0
(x + 3)*(x - 5) = 0
x1 = -3
x2 = 5
J)
(3y + 1)/2 = (y² - 1)/3
9y + 3 = 2y² -2
2y² + 9y + 5 = 0
delta
d² = 81 - 40 = 41
d = √41
y1 = (-9 + √41)/4
y2 = (-9 - √41)/4
K)
(x + 4)² = 9x + 22
x² + 8x + 16 = 9x + 22
x² - x - 6 = 0
delta
d² = 1 + 24 = 25
d = 5
x1 = (1 + 5)/2 = 3
x2 = (1 - 5)/2 = -2
L)
(x - 1)² + 3x = x + 26
x² - 2x + 1 + 3x = x + 26
x² - 25 = 0
x1 = -5
x2 = +5
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