What is the formula for( a-b)
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The formula is (a-b)³=a³-3a²b+3ab²-b³. ... You take the drawing of the formula(a+b)³=a³+3a²b+3ab²+b³ from above and replace a by the difference a-b. Then the edges are (a-b)+b with different combinations (on the left). The term (a-b)³ is illustrated by the blue cube (on the right).
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(a-b)^2 =a^2+b^2-2ab
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