5.find t5 if a=3 and d=-3
Answers
Answered by
0
Answer:
a=2
t
5
=12
⇒a+4d=12
⇒2+4d=12
⇒4d=12−2
⇒4d=10
⇒d=
4
10
∴d=
2
5
t
2
=a+d
=2+
2
5
=
2
4+5
=
2
9
=4.5
t
3
=a+2d
=2+2×
2
5
=2+5=7
t
4
=a+3d
=2+3×
2
5
=2+
2
15
=
2
4+15
=
2
19
=9.5
t
2
=4.5or4
2
1
t
3
=7
t
4
=9.5or9
2
1
Answered by
2
Answer:
a=3 d=-3
tn=a+(n-1) d
t5=3+(5-1) -3
t5=3-12
t5=-9
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