The factorization of the given expression is 5x(5x - 4y) - y(21y + 10z) - z².
The factorization of an algebraic expression is the process of finding two or more factors, whose multiplication results back in the given expression.
From the information given:
The factorization of 25x^2-20xy-21y^2+10yz-z^2 can be computed as:
= 5x(5x - 4y) - y(21y + 10z) - z²
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