factorise

5-15(x+y)²

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Solution

5-15(x+y)^2=5(1-3(x+y)^2)
this cannot be furthur factorised

If this is the actual question consider this answer

15(x+y)² -5x -5y
=15(x+y)² -5(x+y)
=5(x+y) (3 (x+y) - 1) (Taking 5(x+y) common)

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