Mathematics
Factorise the following:
x3 - 25x
Factorisation
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Answer
x3 - 25x
Taking out common in all terms,
x(x2 - 25) = x(x2 - 52).
Using identity,
a2 - b2 = (a - b)(a + b).
x(x2 - 52) = x(x - 5)(x + 5).
Hence, x3 - 25x = x(x - 5)(x + 5).
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