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(x-5)²=4*36
(x-5)²=144
(x-5)²=12²
x-5=12 v x-5=-12
x=17 v x=-7
2.
a1=-1/3
q=1/6:(-1/3)=-1/2
n=10
Sn=a1*(1-q^n)/(1-q)
S10=-1/3*(1-(-1/2)^{10})/(1-(-1/2))=-1/3*2/3*(1-1/1024)=
-2/9*1023/1024=-1/3*341/512=-341/1536
5.
q=-1/3
a1*(-1/3)=-3
a1=9
a7=9*(-1/3)^6
a1*a7=9*9*1/3^6=3^4/3^6=1/3²=1/9
6.
2x=5+20
2x=25
x=12,5
12,5*2=25
y=25*2=50