Use the FOIL method.
1) Multiply First Terms: 2x * 3x = 6x^2
2) Multiply Outer Terms: -4 * 2x = -8x
3) Multiply Inner Terms: 3 * 3x = 9x
4) Multiply Last Terms: 3 * -4 = -12
Add together: 6x^2 - 8x + 9x - 12
Combine Like Terms: 6x^2 + x - 12
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