8x^3 -5x^2 + 8x + 9+5x^3 + 3x^2 - 5x + 4 =
8x^3+5x^3-5x^2 + 3x^2+ 8x - 5x+ 9<span>+ 4 = </span>
13x^3-2x^2+3x+13
Answer:
Step-by-step explanation:
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Answer:
It is the third one because of formula I² + 2I*II + II²
In your case I = 4x and II = 3