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22-07-2018
Mathematics

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find the least common denominator for these two rational expressions

a / a^2 - 6a + 9

7 / a^2 - 8a + 15

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Аноним Аноним

22-07-2018

factor the 2 denominators:-

a^2 - 6a + 9 = (a - 3)(a - 3)

a^2 - 8a + 15 = (a - 3)(a - 5)

((a - 3) is common to both sets of factors so the LCD is:-

(a - 3)(a - 3)(a - 5) or this can be written as (a -3)^2(a - 5)

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