Negative difference

Find four arithmetic progression members between 7 and -6.

Correct result:

a2 =  4.4
a3 =  1.8
a4 =  -0.8
a5 =  -3.4

Solution:

a1=7 a6=6  an=a1+d (n1) a6=a1+5d d=a6a15=(6)75=135=2.6  a2=a1+d=7+(2.6)=225=4.4
a3=a2+d=4.4+(2.6)=95=1.8
a4=a3+d=1.8+(2.6)=45=0.8
a5=a4+d=(0.8)+(2.6)=175=3.4



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