Question

4 - Quanto vale x?
a) x²= 9
b) x²= 25
c) x²= 49
d) x²= 81

Answer 1

Resposta:

$a)\\ x^{2} =9\\ \\ x=\pm\sqrt{9 } \\ \\ x=\pm3$

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$b)\\ x^{2} =25\\ \\ x=\pm\sqrt{25 } \\ \\ x=\pm5$

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$c)\\ x^{2} =49\\ \\ x=\pm\sqrt{49} \\ \\ x=\pm7$

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$d)\\ x^2=81\\ \\ x=\pm\sqrt{81 } \\ \\ x=\pm9$