AP - basics

Determine first member and differentiate of the the following sequence:

a3-a5=24
a4-2a5=61

Correct result:

a =  -1
d =  -12

Solution:


a+2d -(a+4d) = 24
a+3d - 2(a+4d) = 61


a+2•d -(a+4•d) = 24
a+3•d - 2•(a+4•d) = 61

2d = -24
a+5d = -61

a = -1
d = -12

Our linear equations calculator calculates it.



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