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caro67000
1) (x-4) - (x-2) (x-8) = x-4 -(x²-8x -2x+16) = x-4 - x² +8x +2x -16 = 11 x - x² -20
2) 9996² - 9998* 9992= 9996 * 9996 -( 9996+2) (9996-4) = 9996 *9996- 9996²+ 4*9996 -2*9996+8 = 9996 ( 4-2) +8 = 9996*2 +8 = 19992 +8 =20000

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