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= 3x(2x-1)+4(2x-1)
= (2x-1)(3x+4)
2.
b. 3x²-x-10= 3x²+5x-6x-10
= x(3x+5) - 2(3x-5)
= (3x+5)(x-2)
yg no 2.a. itu gk bisa, dari buku kurkul baru kan?! :D semoga membantu;;)