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⇒ (2x) (2x²) + (2x)(5x)+(2x)(-3) + (5) (2x²)+(5)(5x) +(5) (-3)
⇒ 4x³ + 10x² -6x -6x + 10x² + 25x - 15
⇒ 4x³ + 20x² + 13x -15
= 4x^3 + 10x^2 - 6x + 10x^2 + 25x -15
= 4x^3 + 20x^2 + 19x -15