Question
Add the given polynomials : $x^3 – 2x^2 – 9; 5x^3 + 2x + 9$
✓
Answer
$(x^3 – 2x^2 – 9) + (5x^3 + 2x + 9)$
$= x^3 – 2x^2 – 9 + 5x^3 + 2x + 9$
$= x^3 + 5x^3 – 2x^2 + 2x – 9 + 9$
$= 6x^3 – 2x^2 + 2x$
$= x^3 – 2x^2 – 9 + 5x^3 + 2x + 9$
$= x^3 + 5x^3 – 2x^2 + 2x – 9 + 9$
$= 6x^3 – 2x^2 + 2x$
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