Desmond is working on the question to evaluate $2(x+y)(x-y) + [(x+y)^2 - xy] + [(x-y)^2 + xy]$, wh

Question

Desmond is working on the question to evaluate $2(x+y)(x-y) + [(x+y)^2 - xy] + [(x-y)^2 + xy]$, where $x=2026$, $y=2027$. He miscopied $y=2027$ as $y=2072$, however, his answer is still correct. Explain with working, the reason why.

Accepted Answer

$4x^2=16\,418\,704$, independent of $y$

IP1U4 SWII (Further App. of Alg. Id.) Q22

IP1U4 SWII (Further App. of Alg. Id.) Q22

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