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a2=1/2
a3=-1/7
a2:a1=q
1/2: -7/4= -2/7
q=-2/7
an=a1*q^(n-1)
an= -1 3/4* (-2/7)^(n-1)
a₃=-1/7 najpierw trzeba wyznaczyć q
q=a₂/a₁=a₃/a₂
q=1/2/-7/4=-1/7/1/2
q=-2/7
an=a₁*q^(n-1)
an=-7/4 *(-2/7)^(n-1)
an=-7/4 *(-2/7)n *(-2/7)⁻¹
an=-7/4*(-7/2)*(-2/7)^n
an=49/8*(-2/7)^n