simplify the following expression x square minus 21x plus 90 upon x minus 15
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( x^2(x-15) - 21x(x-15) + 90)/x-15
(x^3 - 15x^2- 21x^2 +315 + 90)/x-15
(x^3 - 36x^2 + 405)/x-15
TAKE x-15 AS THE LCM , MULTIPLY x ^2 , 21x WITH x-15 .
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