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a+r+a+3r=8⇒2a+4r=8⇒a+2r=4⇒a=4-2r
(4-2r)(4-r)=6
16-4r-8r+2r²-6=0
2r²-12r+10=0 /:2
r²-6r+5=0
r²-r-5r+5=0
r(r-1)-5(r-1)=0
(r-1)(r-5)=0
r=1 v r=5
a1=2 v a1=-2
a1=2, r=1 lub a1=-2, r=5
2,3,4,5 lub -2,3,8,13 nie spelnia warunkow zadania.
Odp. a1=2, r=1.