Question

log3 ( x-2) + log3 (x+4)= log3 135- log3
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Answer 1

Resposta:

x' =-b+√∆/2a= -2+12/2 = 10/2 = 5 ✓

Explicação passo-a-passo:

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 ✓