Question

m(x-3y)^2+n(3y-x)+5x-15y

Answer 1

Hope u like my process
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--> m (x-3y)² + n (3y - x) +5x - 15y

= m (x-3y)² - n(x - 3y) +5(x-3y)
[Since taking - common from the term multiplied with n]

= (x - 3y){(x-3y) - n +5}
[ taking (x-3y) from all the three terms]

= (x - 3y)(x - 3y - n + 5)
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Hope this is ur required answer
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