Question

2) Resolva as seguintes equações de 2o grau incompletas:

a) 2x² + 10x = 0
b) 9x² – 144 = 0
c) 3x² + 27 = 0
d) 5x² = 0
e) –4x² + 9 = 0
f) 8x² + 6x = 0
g) x² – 10x = 0
h) x² = 0
i) 4x² – 5x = 0
j) 7x² + 4x = 0

por favor me ajudemmmmm

Answer 1

Explicação passo-a-passo:

a) 2x² + 10x = 0

x(2x + 10) = 0

x' = 0

2x + 10 = 0

2x = 0 - 10

2x = -10

x'' = -10/2

x'' = -5

b) 9x² - 144 = 0

9x² = 0 + 144

9x² = 144

x² = 144/9

x² = 16

x = V16

x' = 4

x'' = -4

c) 3x² + 27 = 0

3x² = 0 - 27

3x² = -27

x² = -27/3

x² = -9

x = V-9

d) 5x²  = 0

5x² = 0

x² = 0/5

x² = 0

x = V0

x' = 0

x'' = 0

e)-4x² + 9 = 0

-4x² = 0 - 9

-4x² = -9

x² = -9/-4

x² = 2,25

x = V2,25

x' = 1,5

x'' = -1,5

f) 8x² + 6x = 0

x(8x + 6) = 0

x' = 0

8x + 6 = 0

8x = 0 - 6

8x'' = -6

x = -6/8

x'' = -0,75

g) x² - 10x = 0

x(x - 10) = 0

x' = 0

x - 10 = 0

x = 0 + 10

x'' = 10

x = 10/1

x'' = 10

h) x² + 0 = 0

x² = 0 + 0

x² = 0

x² = 0/1

x² = 0

x = V0

x' = 0

x'' = 0

i) 4x² - 5x = 0

x(4x - 5) = 0

x' = 0

4x - 5 = 0

4x = 0 + 5

4x'' = 5

x'' = 5/4

j) 7x² + 4x = 0

x(7x + 4) = 0

x' = 0

7x + 4 = 0

7x = 0 - 4

7x'' = -4

x'' = -4/7