Question

resolva dentro dos reais

Answer 1

Resposta:

Explicação passo-a-passo:

2.3^(x²-x-1)=6

3^(x²-x-1)=6/2

3^(x²-x-1)=3^1  (corta base 3 com base 3)

x²-x-1=1

x²-x-1-1=0

x²-x-2=0

a=1

b=-1

c=-2

x=-(-1)+-V(-1)²-4.1.-2/2.1

x=+1+-V1+8/2

x=+1+-V9/2

x=+1+-3/2

x'=+1+3/2=+4/2=+2

x''=+1-3/2=-2/2=-1

S={-1,+2}