## highest common factorOf two or more integers, the largest integer which they share as a factor. For example, the highest common factor (hcf) of 15 and 17 is 1, since 17 is a prime number. In algebra, the hcf of two or more algebraic expressions may be found by examination of the factors of each: hence the hcf of 9 ax^{2}
(= 3.3.a.a.x.x) and 3ax^{2} (= 3.a.a.x)
is 3a.x. ## Related category• TYPES OF NUMBERS | |||||

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