Question

1) Identifique os coeficientes:
a) x² = x + 12
b) 2x² = -12x - 18
c) x² + 9 = 4x
d) 25x² = 20x – 4
e) 2x = 15 – x²
f) x² + 3x – 6 = -8
g) x² + x – 7 = 5
i) 4x² - x + 1 = x + 3x2
j) 3x² + 5x = -x – 9 + 2x²
k) 4 + x ( x - 4) = x
l) x ( x + 3) – 40 = 0

2) Resolva as equações do 2o grau incompletas, nas quais b= 0.
a)x² - 144 = 0
b) x² - 9 = 0
c) x² -121 = 0
d) x² = 25
e) x² = 81
f) x² = 72
g) x² = 642
h) x² = 112

Answer 1

Explicação passo-a-passo:

1)

a) a = 1; b = -1; c = -12

b) a = 2; b = 12; c = 18

c) a= 1; b = -4; c = 9

d) a= 25;b = -20 ; c = 4

e) a= 1; b= 2; c= -15

f) a=1; b = 3; c = 2

g) a= 1; b = 1 ; c = -2

I) a= 1; b = -2; c = 1

j) a= 1; b = 6; c = 9

k) a= 1 ; b = -5; c = 4

l) a = 2; b = 3; c = -40

2)

a) x^2- 144 = 0

x^2=+_√144 = +_ 12

b) x^2-9 = 0

x^2= +_√9= +_3

c) x^2-121= 0

x^2 = +_√121= +_ 11

d)x^2= 25

x= +_ √25= +_ 5

e) x^2= 81

x = +_ √ 81 = +_ 9

f) x^2= 72

x = +_ √ 72 = +_ 6√2

g) x^2= 642

x= +_√642 = +_ 25,33

h) x^2= 112

x = +_ √ 112 = +_ 4 √ 7