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b. 5x²-x+25x-5 = 5x²+24x-5
c. -14r+49+4rx+14x
20 y - 100
(x + 5) × (5x - 1) =
5x^ - x + 25x - 5 =
5x^ + 24x - 5
(7 - 2r) - (2r - 7) =
7 - 2r - 2r + 7 =
-2r - 2r + 7+ 7 =
-4r + 14