What is the factored form of x3 + 125?

Recognize x³ + 125 as a sum of cubes: x³ + 5³. Use the identity a³ + b³ = (a + b)(a² − ab + b²). Substituting a = x and b = 5 gives (x + 5)(x² − 5x + 25), which is choice C.

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