3l(l-4m+5n) from 4l(10n-3m+2l).
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Step-by-step explanation:
3l (l-4m + 5n) =
3l^2 - 12lm + 15 ln
4l (10n - 3m +2l)
40ln - 12lm + 8l^2
4l (10n - 3m +2l) - 3l (l-4m + 5n) =
(40ln - 12lm + 8l^2) -( 3l^2 - 12lm + 15 ln)
= 40ln - 12lm + 8l^2 - 3l^2 + 12lm + 15 ln)
= 55ln -5l^2
= 5l (11n - l)
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