Question 896351: Hi I need help with this math problem. -7+40 has to be arithmetic sequence, what are the first three terms? How can I solve this problem?
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! Hi I need help with this math problem. -7+40 has to be arithmetic sequence, what are the first three terms? How can I solve this problem?
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a(4) = a(1) + 3d = -7
a(5) = a(1) + 4d = 40
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Subtract and solve for "d"::
d = 47
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Solve for "a(1)"::
a(1) + 3(47) = -7
a(1) = -148
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1st three terms:: -148, -148+47, -148+2(47)
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Ans: = -148, -101, -54
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Cheers,
Stan H.
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