Respostas

  • Usuário do Brainly
2013-02-18T15:19:33-03:00

Observe que:

 

(\text{a}+\text{b}})^2=\text{a}^2+2\text{ab}+\text{b}^2

 

Desta maneira, temos que:

 

(\text{a}+5)^2=\text{a}^2+10\text{a}+25

 

Seja \text{X}=\text{a}^2+(\text{a}+5)^2

 

Logo, podemos afirmar que:

 

\text{X}=\text{a}^2+\text{a}^2+10\text{a}+25=2\text{a}^2+10\text{a}+25

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