Question

determine as as raízes das funções definidas f(×)2_9×+8​

Answer 1

x² - 9x + 8 = 0

∆=(-9)² -4.1.8 = 81 -32= 49 => √∆=7

x' = -b+√∆/2a = 9+7/2= 16/2= 8 ✓

x" = -b-√∆/2a = 9-7/2 = 2/2 = 1 ✓