Factor completely the following expression

MATHEMATICS · Subjective · AoPS · Mathematics · More Variables · More Variables

Problem

Factor *completely* the following expression. (That is, take out common factors, including leading negatives, if any, then factor what's left into binomials.)

-28x^4y^5 + 63x^3y^6 + 91x^2y^7

Related theory

Algebraic Identities
Polynomials
Factorisation of Polynomials
Polynomial Functions
Algebra

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