Question

X ao quadrado menos x - 30 = 0

Answer 1

Resposta:

x²-x-30= 0

∆= b²-4ac a=1 b=-1 c=-30

∆= -1²-4 . 1 . -30

∆= 1+120

∆= 121

x= -b+-√∆/2a

x= 1+11/2.1

x= 12/2

x1= 6

x=1-11/2.1

x=-10/2

x=-5