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27 June, 19:48

How would the sum of cubes formula be used to factor x3y3+343? Explain the process. Do not write the factorization.

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  1. 27 June, 21:05
    0
    x^3y^3 + 343

    The way the sum of cubes works is by taking the roots of each term and applying the formula.

    The sum of cubes is as follows:

    a^3 + b^3 = (a + b) (a^2 - ab + b^2)

    In this case, we would display it like this:

    x^3y^3 + 343 = (xy + 7) (x^2y^2 - 7xy + 49)
  2. 27 June, 22:21
    0
    To factor, first identify the quantities that are being cubed. The first term is the cube of xy, and the constant is the cube of 7. Next, use the formula to write the factors. The first factor is the sum of xy and 7. The second factor has three terms: the square of xy, the negative of 7xy, and the square of 7.
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