Resposta :

[tex]f(x+h)-f(x)=\\ (x+h)^2-x^2=\\ x^2+2xh+h^2-x^2=\\ h^2+2hx[/tex]

PaxOne

[tex]x^2+2xh+h^2-x^2=\\ 2hx+h^2=\\\\ h(2x+h)[/tex]

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