Add the following polynomials: (4x^{2} + 2x – 3) + (x^{2} – x + 9)

Just remove the parenthesis and combine like terms

4x^2 + 2x - 3 + x^2 - x + 9

= 5x^2 + x + 6

Subtract the following polynomials: (–3x^{2} + 3x + 3) – (–2x^{2} – 10x + 2)

so would this be -x^{2}+13x+1 ?

YES, very good.

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