Question

Свойства арифметической прогресси

Answer 1

x1 =-4* 1^2 +7= 3 
x2=-4* 2^2 +7= -9
x3= -4* 3^2 +7= -29 
x4= - 4* 4^2+7 = -57
x5= -4* 5^2+7= - 93
x6= -4* 6^2+7 = -137