Respuesta:
(x+3)(x-3) + (x+5)(x-5) + (2-x)(2+x) + (6-x)(6+x)
[tex]=x^2-9+\left(x+5\right)\left(x-5\right)+\left(2-x\right)\left(2+x\right)+\left(6-x\right)\left(6+x\right)\\\\=x^2-9+x^2-25+\left(2-x\right)\left(2+x\right)+\left(6-x\right)\left(6+x\right)\\\\=x^2-9+x^2-25+4-x^2+\left(6-x\right)\left(6+x\right)\\\\=x^2-9+x^2-25+4-x^2+36-x^2\\\\=6[/tex]
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Verified answer
Respuesta:
(x+3)(x-3) + (x+5)(x-5) + (2-x)(2+x) + (6-x)(6+x)
[tex]=x^2-9+\left(x+5\right)\left(x-5\right)+\left(2-x\right)\left(2+x\right)+\left(6-x\right)\left(6+x\right)\\\\=x^2-9+x^2-25+\left(2-x\right)\left(2+x\right)+\left(6-x\right)\left(6+x\right)\\\\=x^2-9+x^2-25+4-x^2+\left(6-x\right)\left(6+x\right)\\\\=x^2-9+x^2-25+4-x^2+36-x^2\\\\=6[/tex]