Question 1034684

{{{f+g=3x^2-7x+5+x^2+4=highlight(4x^2-7x+9)}}}
{{{f-g=3x^2-7x+5-(x^2+4)=3x^2-7x+5-x^2-4=highlight(2x^2-7x+1)}}}
{{{f*g=(3x^2-7x+5)(x^2+4)=3x^2*x^2-7x*x^2+5*x^2+3x^2*4-7x*4+5*4=3x^4-7x^3+5x^2+12x^2-28x+20=highlight(3x^4-7x^3+17x^2-28x+20)}}}
{{{f/g= highlight((3x^2-7x+5)/(x^2+4))}}}......this cannot be simplified