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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