a.f(x)=-3x^2+x+1-x^4+x^3-x^2+3x^4
f(x)=-4x^2+x+1+2x^4+x^3
f(x)=2x^4+x^3-4x^2+x+1
g(x)=x^4+x^2-x^3+x-5+4x^3-x^2
g(x)=x^4+3x^3+x-5
b. f(x)=2x^4+x^3-4x^2+x+1
+
g(x)=x^4 +3x^3 +x-5
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f(x)+g(x)=3x^4+4x^3-4x^2+2x-4
f(x)=2x^4+x^3-4x^2+x+1
-
g(x)=x^4 +3x^3 +x-5
____________________________
f(x)-g(x)=x^4-2x^3-4x^2+6
c.f(x)+g(x)=3x^4+4x^3-4x^2+2x-4
Thay x=-1,ta có
f(1)+g(1)=3. (-1)^4+4.(-1)^3-4. (-1)^2+ 2.(-1)-4
f(1)+g(1)=3-12-4-6
f(1)+g(1)=-18
Cho xin ctlhn nha
please
Thank you
