Question

Resolva a equação do segundo grau: 4x2-36+72=0

Answer 1

corrijida:

4x² -36x +72=0 ===> :(4)

x² -9x +18 = 0

-b/c = 9/18= 3+6/3•6 => x'=3, x"=6

baskarando:

x² -9x +18 = 0

∆=(-9)² -4.1.18=81 -72= 9 => √∆=3

x= -b±√∆/2a

x = 9±3/2

x' = 9+3/2 = 6

x"= 9-3/2 = 3