Question

Resolva com Δ= - b²-4ac e com x = – b ± √Δ
2·a

7x²+13x-1=0

Answer 1

Olá !



Resolução


7X² + 13X - 1 = 0

A = 7 ; B = 13 ; C = -1


∆ = b² - 4ac

∆ = 13² - 4 • 7 • (-1)

∆ = 169 + 28

∆ = 197


X = -b ± √∆ / 2a

X = -13 ± √197 / 2 • 7

X = -13 ± 14,03/14

X' = -13 + 14,03/14 = 1,03/14 ≈ 0,073
X'' = -13 - 14,03/14 = -27,03/14 ≈ -1,93




Resposta :



S = {-1.93 , 0,073}