a: \(f\left(x\right)=10x^7-5x^5-6x^3+4x+\dfrac{1}{4}\)
\(G\left(x\right)=9x^8-7x^6-5x^4+3x^2+\dfrac{3}{4}\)
\(f\left(x\right)+g\left(x\right)=9x^8+10x^7-7x^6-5x^5-5x^4-6x^3+3x^2+4x+1\)b
b: \(f\left(x\right)-g\left(x\right)\)
\(=-9x^8+10x^7+7x^6-5x^5+5x^4-6x^3-3x^2+4x-\dfrac{1}{2}\)
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