Question

Resolva a equação log3 (x - 2) + log3 (x + 4) = log3 135 - log3 5.​

Answer 1

log3 (x-2) + log3 (x+4)=log3 135 - log3 5

log3 (x-2) • (x+4)=log3 (135 /5)

(x-2) • (x+4)= (135 /5)

x²+2x-8=27

x²+2x-35=0

∆= 2² -4.1.(-35)=144 => √∆=12

x' =-b+√∆/2a= -2+12/2 = 10/2 = 5 ✓