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x.x+x.4+5.x+5.4
x²+4x+5x+20
x²+9x+20
2. (3x+2)(2x-3)
3x.2x+3x.-3+2.2x+2.-3
6x²-9x+4x-6
6x²-5x-6
3.(3x-4)(5x+3)
3x.5x+3x.3-4.5x-4.3
15x²+9x-20x-12
15x²-11x-12
2.
3.