4) a. -20, -5, 10,.....
a = -20
b = -5-(-20) = 10-(-5) = 15
Un = a+(n-1)b
U12 = -20+(11×15) = -20+165 = 145
b. 25, 22, 19,.....
a = 25
b = 22-25 = 19-22 = -3
U8 = 25+(7×(-3)) = 25+(-21) = 4
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4) a. -20, -5, 10,.....
a = -20
b = -5-(-20) = 10-(-5) = 15
Un = a+(n-1)b
U12 = -20+(11×15) = -20+165 = 145
b. 25, 22, 19,.....
a = 25
b = 22-25 = 19-22 = -3
Un = a+(n-1)b
U8 = 25+(7×(-3)) = 25+(-21) = 4