Question

x2-3x -4 = 0 preciso urggente​

Answer 1

x² - 3x - 4 = 0

x = - ( - 3 ) ± ✓ ( - 3 )² - 4 × 1 × ( - 4 )

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2 × 1

x = - ( - 3 ) ± ✓ ( - 3 )² - 4 × ( - 4 )

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2

x = + 3 ± ✓ 9 - 4 × ( - 4 )

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2

x = + 3 ± ✓ 9 + 16

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2

x = + 3 ± ✓ 25

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2

x = + 3 ± 5

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2

x = + 3 + 5 + 8

________ = _______ = 4

2 2

x = + 3 - 5 - 2

________ = _______ = - 1

2 2

x1 = - 1

x2 = 4

Espero ter ajudado! Bons estudos!