I dont understand why we are doing: x 3 -b 3 =1+(x) ×(b) ×3???
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The question is not completely given, Given x - b = 1
so (x - b)³ = x³ + 3 x² (-b) + 3 x (-b)² - b³
1³ = x³ - 3 x b (x - b) - b³
1 = x³ - 3 x * b * 1 - b³
1 = x³ - b³ - 3 x b
So x³ - b³ = 1 + 3 * x * b
so (x - b)³ = x³ + 3 x² (-b) + 3 x (-b)² - b³
1³ = x³ - 3 x b (x - b) - b³
1 = x³ - 3 x * b * 1 - b³
1 = x³ - b³ - 3 x b
So x³ - b³ = 1 + 3 * x * b
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