Pada deret aritmatika diketahui u5=-6 dan u6=-9 tentukan u,0 dari deret tsb...?
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U₆=-9
Un=a+(n-1)b
U₅=a+(5-1)b
-6 =a+4b
U₆=a+(6-1)
-9 =a+5b
u₆=a+5b=-9
U₅=a+4b=-6 _
b=-3
a+4b=-6
a+4(-3)=-6
a+(-12)=-6
a =-6+12
a=6
Un=a+(n-1)b
=6+(n-1) (-3)
=6+(-3n+3)
=9-3n