W(x) =3x ²-2xG(x)=2x²+4x-1H(x) =-x ² +5A)W(x)+G(x)b)G(x)+G(x)c)G(x)+H(x)
W(x) =3x ²-2xG(x)=-x ² +5H(x) =-x ² +5A)W(x)+G(x)=3x ²-2x+2x²+4x-1=5x²+2x-1b)G(x)+G(x)=2x²+4x-1+2x²+4x-1=4x²+8x-2c)G(x)+H(x)=2x²+4x-1+(-x ² +5)=x ²+4x +4
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W(x) =3x ²-2x
G(x)=-x ² +5
H(x) =-x ² +5
A)W(x)+G(x)=3x ²-2x+2x²+4x-1=5x²+2x-1
b)G(x)+G(x)=2x²+4x-1+2x²+4x-1=4x²+8x-2
c)G(x)+H(x)=2x²+4x-1+(-x ² +5)=x ²+4x +4