Inner: \( -4 \times 2x = -8x \).

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• Use the distributive property (FOIL method) to expand:
• First: \( 3x \times 2x = 6x^2 \).
• Outer: \( 3x \times 5 = 15x \).
• Last: \( -4 \times 5 = -20 \).
• Combine like terms: \( 6x^2 + 15x - 8x - 20 = 6x^2 + 7x - 20 \).
• Therefore, the quadratic expression is \( 6x^2 + 7x - 20 \).

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