find the cube of 198 using the expansion formula
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(200-2)^3
(a-b)^3 =a^3-b^3-3ab (a-b) (200-2)^3=200-3-213-3x200x2 (200-2) =8000000-8-1200 (200-2) =8000000-8-240000-2400 =7,762,392
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