Question

me ajudem pls fico agradecido

Answer 1

a)

x² + 4x = 0
x(x + 4) = 0
x = 0
x + 4 = 0
x = -4

b)

3x² - 48 = 0
3x² = 48
x² = 48/3
x² = 16
x = +4
x = -4

c)

x² - 81 = 0
x² = 81
x = +9
x = -9

d)

2x² - 3x + 1 = 0

S = x₁ + x₂ = 3/2
P = x₁.x₂ = 1/2

x₁ = 1
x₂ = 1/2

e)

-x² + 2x - 8 = 0

S = x₁ + x₂ = 2
P = x₁.x₂ = -8

x₁ = 4
x₂ = -2

f)

x² - 5x = -6
x² - 5x + 6 = 0

S = x₁ + x₂ = 5
P = x₁.x₂ = 6

x₁ = 2
x₂ = 3