find the zeros of the quadratic polynomial x2-4x-32, and verify the relationship between the zeros and the coficient of the polynomials
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by factorisation
x2-8x+4x-32
x(x-8)+4(x-8)
(x-8)=0,(x+4)=0
x=8,x=-4
Relationship
alpha+beta=-b/a
8+(-4)=-(-4)/1
4=4
alpha×beta=c/a
8×(-4)=-32/1
-32=-32
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