The sum of n term of ap is 3n2+5n2 find the ap and its 15 term
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Answer:
The AP is 8,24,40_ _ _ _
The 15th term is 232.
Step-by-step explanation:
Sum of n terms= 3n²+5n²
a₁=3×1+5×1
a₁=8
a₁+a₂=8+a₂
3×4+5×4=8+a₂
12+20=8+a₂
12+12=a₂
24=a₂
d=16
a₁₅=a+14d
=8+14×16
=8(1+28)
=8×29
=232
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