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a2=a1*q
a5=a1*q^4 <-------- układ równań
4=a1*q/:q
-32=a1*q^4
a1=4/q
-32=4*q^4/q
a1=4/q
-32=4q^3/:4
a1=4/q
-8=q^3
q=-2
a1=4/q
a1=4/2
a1=2
S9=a1(1-q^9)/1-q
s9=2*(1-(-512))/1-(-2)
s9=2*(513)/3
s9=342