Question

a) 7x2 + 13x - 2 = 0
esse x2 é x au quadrado​

Answer 1

∆ = 13² - 4 7 -2

∆ = 169 + 56

∆ = 225

- 13 ± √255 / 2.7

-13 ± 15 / 14

x' = -13 + 15/14 = 2/14 = 1/7

x" = -13 - 15/14 = -28/14 = -2