Question

3x²-x-4=0
qual a conta?

Answer 1

3x² - x - 4 = 0

a = 3  b = -1  c =  - 4

delta = b² - 4ac

delta = (-1)² - 4 . 3 . (-4)

delta = 1 + 48

delta = 49

x = - b +- √Δ /2a

x = - (-1) + - √49 /2.3

x = (1 +- 7 )/6

x' = (1 + 7)/6

x' = 8/6  :2

x' = 4/3

x'' = ( 1 - 7)6

x'' = -  6/6

x'' = - 1