book Maths Puzzle Numerical Ability

Suppose you add a polynomail of degree m from a polynomial of degree n where m>n. The results is a polynomial of degree ___.

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book Other Question

x^3+x^2+ sqrt(x^2+3x)=6

I've tried to square both sides, I've tried setting the equation equal to 0, I've tried to factor out x^2+x, I'm just at a loss.

Thanks for your help! i need to classify the polynomial function by number of terms and by degree

n=5m^2-3m^3