125 x cube -343 y cube
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Answer:
125 x^3 - y^3
=(5x)^3 - (y^3
use identity :
a^3 - b^3 = (a - b) (a^2 + ab + b^2)
=( 5 x - y){ (5 x )^2 + ( 5x ) ( y) + (y)^2}
=(5x-y) (25 x^2 + 5 x y + y^2)
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