Question

Add the polynomials (4x2 - 9x + 4) + (7x3 - 9x

Answer 1

$(4x^2-9x+4)+(7x^3-9x)$

we remove the parenthesis and add the number that have the same exponent

$\begin{gathered} 4x^2-9x+4+7x^3-9x \\ 7x^3+4x^2+(-9x-9x)+4 \\ 7x^3+4x^2-18x+4 \end{gathered}$