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Si f(x) = 1-x^2

Si f(x)=-5x^2-3

Si f(x)= -x^2+4x-8

Si f(x)=3x^2+2x-1

Si f(x)= 7x^2-2x

-9x^2+3

a=-9; b=0; c=3

a=7; b=-2; c=0

a=-1; b=0; c=1

a=-5; b=0; c=-3

a=-1; b=4; c=-8

a=3; b=2; c=-1