Question

x²-x-2=0 alguem me ajuda ae pfvr​

Answer 1

Explicação passo-a-passo:

x² - x - 2 = 0

a = 1 ; b = - 1 ; c = - 2

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x = - b ± √b² - 4ac/2a

x = - (-1) ± √(-1)² - 4.1.(-2)/2.1

x = 1 ± √1 + 8/2

x = 1 ± √9/2

x = 1 ± 3/2

x' = 1+3/2 = 4/2 = 2

x" = 1-3/2 = - 2/2 = - 1

S = {- 1 ; 2}