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4vir4ik [10]
3 years ago
12

I NEED HELP PLZ, PLZ, I NEED HELP, I AM BEGGING YOU

Mathematics
2 answers:
erastova [34]3 years ago
8 0

Answer:

tn = 8n -7

Step-by-step explanation:

given : t2=9, t4=25

the formula is:

tn = t1 + (n-1) d

gonna find d first:

d = (25-9) /(4-2) = 16/2 = 8

and find tn1:

t1 = 9-8 = 1

so, tn = 1 + (n-1) (8) = 1 +8n -8

tn = 8n -7

mel-nik [20]3 years ago
7 0

Answer:

Solution given

n th term[tn]=?

1st term =a

difference =d

we have

t2=9

a+(n-1)d=9

a+(2-1)d=9

a+d=9

a=9-d..................[1]

again

t4=25

a+(n-1)d=25

a+(4-1)d=25

now

substituting value of a

9-d+3d=25

2d=25-9

d=16/2

d=8

substituting value of d in equation 1.

,a=9-8

a=1

we have

tn term =a+(n-1)d=1+(n-1)8=1+8n-8=<u>8</u><u>n</u><u>-</u><u>7</u>

<u>n</u><u> </u><u>t</u><u>h</u><u> </u><u>t</u><u>e</u><u>r</u><u>m</u><u> </u><u>=</u><u>8</u><u>n</u><u>-</u><u>7</u><u> </u>

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