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= 5x(2-x) -2(2 - x)
= 10x - 5x² -4 +2x
= 10x + 2x - 5x² - 4
= 12x - 5x² - 4
(10x)+(-4-5x²)+(2x)
10x-4×-5x²+2x
-5x²+10x+2x-4
-5x²+12x-4