Question

Resoluçao dessa questão de 2.° grau
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Answer 1

6x² - x - 1 = 0

A= 6

B= - 1

C= - 1

∆= b² - 4ac

∆= ( - 1)² - 4 • 6 • ( - 1)

∆= 1 + 24

∆= 25

x= - b ± √∆ /2a

x= - ( - 1) ± √25 / 2 • 6

x= 1 ± 5/12

x'= 1 + 5/12 = 6/12 = 1/2

x''= 1 - 5/12 = - 4/12 = - 3/4

S= ( - 3/4 , 1/2)