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b= 3(2kuadrat) - 5x2 - 3x1 - 5x1
b = 2-(-2)
b=4
s2= 3x2²- 5x2= 12 -10 = 2
s3= 3x9 - 5x3= 27-15 =12
s2-s1 = u2 = 2 - (-2) = 4
u2 - s1 = b
a. b= 4 - (-2) = 6
b. un = a + (n-1)b
un= -2 + (n-1)6
un= -2 +6n-6
un= 6n-8