Question

Determine as raizes da função -x ao quadrado + x +42

Answer 1

Explicação:

- x² + x + 42 = 0

a = - 1

b = 1

c = 42

∆ = b² - 4ac

∆ = ( 1 )² - 4 × ( - 1 ) × 42

∆ = ( 1 × 1 ) - 4 × ( - 42 )

∆ = 1 + 168

∆ = 169

- b ± √∆

x = —————

2a

- ( 1 ) ± √( 169 )

x = ————————

2 × ( - 1 )

- 1 ± 13

x = ————

- 2

- 1 - 13

x' = ————

- 2

- 14

x' = ——

- 2

x' = 7

- 1 + 13

x'' = ————

- 2

12

x'' = ——

- 2

x'' = - 6