Question

x² - 4x - 5 = 0 alguém sabe?

Answer 1

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x² - 4x - 5 = 0

a = 1,b = -4,c = -5

x = -(-4) ± √(-4)² - 4(1)(-5)

2(1)

x = 4 ± √16 + 20

2

x = 4 ± √36

2

x = 4 ± 6

2

x = 2 ± 3

x1 = 5

x2 = -1

S = { 5 ; -1 }

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Att: MarcosPCV