Question

a) x²+6x+5=0

b) 3x²-2x=0

c) 5x²-125=0

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Answer 1

Resposta:

a) x²+6x+5=0

∆ = 6² - 4.1.5 = 36 - 20 = 16

$x = \frac{ - 6 - 4}{2} = \frac{ - 10}{2} = - 5 \\ x = \frac{ - 6 + 4}{2} = \frac{ - 2}{2} = - 1$

S = {-5, -1}

b) 3x²-2x=0

x(3x -2) = 0

x = 0

3x - 2 = 0

3x = 2

x = 2/3

S = {0,2/3}

c) 5x²-125=0

5x² = 125

x² = 125/5

x² = 25

x = √25

x = ±5

S = {-5, +5}