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05-07-2017
Mathematics

contestada

Which is a factor of 5xy − 40x − 15y + 120?
A. 2
B. y − 8
C. x − 4
D. x + 6

Respuesta :

05-07-2017

Upon slight rearranging:

5xy-15y-40x+120, now factor 1st and 2nd pair of terms

5y(x-3)-40(x-3) which is equal to:

(5y-40)(x-3) if we factor the first parenthetical term as well

5(y-8)(x-3)

So (y-8) is a factor

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