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2. (2u-5)(u+2)
3. (u-5)(u+3)
(u-10)(u+6) = u^2 - 4u - 60
no 4nya gak biasa
2.) 2x²-x-10 = 2x²+4x-5x-10 = 2x(x+2) -5(x+2) = (2x-5)(x+2)
3.) x²-2x-15 = x²+3x-5x-15 = x(x+3) -5(x+3) = (x-5) (x+3)
4.) 3x²-x-15 = ( Soal tidak valid )
5.) x²+4x-60 / x-10 = ......... (Soal tidak valid)