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Sagot :

The cubic regression formula is :Y=a+bx+cx^2+dx^3,

Given the following points (-2;-28) (0;-4) (4;168)(-5;-174)

a =-4

b=-1

c=3

d=2

• By plotting the values : Y = -4 +(-1)x + 3x^2 +2x^3

y =2x^3+ 3x^2 - x - 4

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