what is the formula for (a+b)³
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You convert it to (a-b)³=a³-3ab(a-b)-b³ for an illustration. You take the drawing of the formula (a+b)³=a³+3a²b+3ab²+b³ from aboveand replace a by the difference a-b. Then the edges are (a-b)+b withdifferent combinations (on the left). The term (a-b)³ is illustrated by the blue cube (on the right).
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=a³+3a²b+3ab²+b³......
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