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Another formula for factoring is the sum or difference of two cubes. The sum can be represented by
Another formula for factoring is the sum or difference of two cubes. The sum can be represented by
:<math> a^3 + b^3 = (a + b)(a^2 - ab + b^2),\,\!</math>
:<math> a^3 + b^3 = (a + b)(a^2 - ab + b^2),\,\!</math>
Note : the second factor never becomes zero with real ''a'' and ''b''
and the difference by
:<math> a^3 - b^3 = (a - b)(a^2 + ab + b^2).\,\!</math>
For example, ''x''<sup>3</sup> &minus; 10<sup>3</sup> (or ''x''<sup>3</sup> &minus; 1000) can be factored into (''x'' &minus; 10)(''x''<sup>2</sup> + 10''x'' + 100).
Note : the second factor never becomes zero with real ''a'' and ''b''

===Sum/difference of two fourth powers===
THis can always be factored as follows :
<math> a^4 + b^3 = (a + b)(a^2 - ab + b^2),\,\!</math>
and the difference by
and the difference by
:<math> a^3 - b^3 = (a - b)(a^2 + ab + b^2).\,\!</math>
:<math> a^3 - b^3 = (a - b)(a^2 + ab + b^2).\,\!</math>

Revision as of 12:43, 25 March 2011

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Factoring other polynomials

Sum/difference of two cubes

Another formula for factoring is the sum or difference of two cubes. The sum can be represented by

Note : the second factor never becomes zero with real a and b and the difference by

For example, x3 − 103 (or x3 − 1000) can be factored into (x − 10)(x2 + 10x + 100). Note : the second factor never becomes zero with real a and b

Sum/difference of two fourth powers

THis can always be factored as follows : and the difference by

For example, x3 − 103 (or x3 − 1000) can be factored into (x − 10)(x2 + 10x + 100).