Question

factorize (x+y)square-(x+y)+2=0
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Answer 1

SOLUTION,

let, (x+y)=a

${a}^{2} - a + 2 = 0 \\ a= \frac{ - 1 + - \sqrt{ {( - 1)}^{2} - 4 \times (1) \times (2) } }{2 \times 1}$

YOU CAN EASILY SEE THIS IS A IMAGINARY NUMBER...