1.

(3x³ + 3x² – 4x + 5) + (x³ – 2x² + x – 4)​

Answer»

\sf{\left(3x^3+3x^2-4x+5\right)+\left(x^3-2x^2+x-4\right)}

\sf{=3x^3+3x^2-4x+5+x^3-2x^2+x-4}

\sf{=3x^3+x^3+3x^2-2x^2-4x+x+5-4}

\sf{=3x^3+x^3+x^2-4x+x+5-4}

\sf{=4x^3+x^2-4x+x+5-4}

\sf{=4x^3+x^2-3x+5-4}

\sf{=4x^3+x^2-3x+1}


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