The first and last terms of a 10-term arithmetic series are listed in the table. What is the sum of the series?
2 answers:
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It is a quadratic
where x-8 is the squared term
do
x-8=u
u^2-13u+30=0
solve
u=
u=
u=
u=
u=
u=
or u=
u=10 or 3
10=x-8 or 3=x-8
18=x or 11=x
x=11 and/or 18
where x-8 is the squared term
do
x-8=u
u^2-13u+30=0
solve
u=
u=
u=
u=
u=
u=
u=10 or 3
10=x-8 or 3=x-8
18=x or 11=x
x=11 and/or 18