if a polynomial function crosses x axis at a x=c , then polynomial function will have a term (x-c).
if a polynomial function just touches x axis at x=k , then polynomial function will have term (x-k)2
given graph crosses x axis at x=-2 . so it will have term (x+2).
given function just touches x axis at x= -1 . so it will have term (x+1)2.
given graph crosses x axis at x=1 . so it will have term (x-1).
so
function can be represented using this terms as
f(x) =C *(x+2)(x+1)2(x-1)'
here C is any constant .
from graph , it passes through (0,-1) . so apply this to equation and find C (when x=0 , f(x) is -1)
f(0)= -1= C*(0+2)(0+1)2(0-1)
-1= C*-2
so equation is
option D
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