The square of 3 (x + y) - 7 (x + y) + 8 (x + y) + 6 (x + y) - 11 (x + y) =? | Math enthusiast | Mathematical art

The square of 3 (x + y) - 7 (x + y) + 8 (x + y) + 6 (x + y) - 11 (x + y) =?

A:
3(x+y)²-7(x+y)+8(x+y)²+6(x+y)-11(x+y)²
=(3+8-11)(x+y)²+(6-7)(x+y)
=0-(x+y)
=-x-y

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