Question

(x+1)²+(x+1)²-(2x+1)²
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Answer 1

(x + 1 )² + (x + 1)^2 - (2x +1)²=
(x² +2x + 1) + (x² +2x +1) - (4x² + 4x +1)=
x² +2x +1 + x² +2x +1 - 4x² -4x -1=
2x² - 4x² +4x -4x +2 -1=
-2x² +1