For two polynomials: \(f\left(x\right)=x^3-4x^2-7x-1\) and \(g\left(x\right)=x^4+x^3-x^2-7x+2\)
a, Calculated \(f\left(2\right)\) và \(g\left(\dfrac{1}{2}\right)\)
b, Indicate that \(f\left(x\right)-g\left(x\right)\)
Always accepts negative values for every value of the variable
