if f(x) =x²-5x+7,g(x)=3x²+2x-1,find f+g,f-g, f.g,f/g
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f[x]= x^2 -5x +7
g[x]=3x^2 +2x -1
f+g = [x^2 -5x +7] + [3x^2 +2x -1]
4x^2 -3x +6
f-g = [x^2 -5x +7] - [3x^2 +2x -1]
= -2x^2 -7x +8
f.g = [x^2 -5x +7].[3x^2 +2x -1]
= 3x^4 +2x^3 -x^2 -15x^3 -10x^2 +5x +21x^2 +2x -7
= 3x^4 -13x^3 -9x^2 +7x -7
g[x]=3x^2 +2x -1
f+g = [x^2 -5x +7] + [3x^2 +2x -1]
4x^2 -3x +6
f-g = [x^2 -5x +7] - [3x^2 +2x -1]
= -2x^2 -7x +8
f.g = [x^2 -5x +7].[3x^2 +2x -1]
= 3x^4 +2x^3 -x^2 -15x^3 -10x^2 +5x +21x^2 +2x -7
= 3x^4 -13x^3 -9x^2 +7x -7
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