[tex]1) d=5-(-2)=7\\S4=\frac{2*(-2)+7*(4-1)}{2} *4\\S4=-4+21*2= 34[/tex]
[tex]\\\\\\\\\\\\2) q=\frac{-6}{-2} =3\\S4=\frac{-2(3^{4} -1)}{3-1}=\frac{-160}{2} =-80[/tex]
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[tex]1) d=5-(-2)=7\\S4=\frac{2*(-2)+7*(4-1)}{2} *4\\S4=-4+21*2= 34[/tex]
[tex]\\\\\\\\\\\\2) q=\frac{-6}{-2} =3\\S4=\frac{-2(3^{4} -1)}{3-1}=\frac{-160}{2} =-80[/tex]