Question

me ajudem

por favor!
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Answer 1

Resposta::

$a)\\ (2x+1)^2+(x-5)^2=\\ \\ 4x^2+4x+1+x^2-10x+25=\\ \\ 4x^2+x^2+4x-10x+1+25=\\ \\ \fbox{ 5x^2-6x+26 }$

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$b)\\ (x-1)^2-(x+1)^2=\\ \\ x^2-2x+1-(x^2+2x+1)=\\ \\ x^2-2x+1-x^2-2x-1=0\\ \\ \not x^2-\not x^2-2x-2x+\not1-\not1=0\\ \\\fbox{ -4x }$