Question

Resolver:
( N + 0,71 )²= ( 15,12 ÷ 7,2 )²

Answer 1

$(N+0,71)^2 = \left(\dfrac{15,12}{7,2}\right)^2\\\\ (N+0,71)^2 = \left(2,1\right)^2\\\\ N+0,71 = \pm\sqrt[2]{\left(2,1\right)^2}\\\\ N+0,71 = \pm\sqrt[\not2]{\left(2,1\right)^{\not2}}\\\\ N+0,71 = \pm2,1\\\\ N=\pm2,1-0,71\\\\\\ N'=+2,1-0,71\ \rightarrow \boxed{N'=1,39}\\\\ N''=-2,1-0,71\ \rightarrow \boxed{N''=-2,81}$


EQUAÇÃO EXTRA:

$\sqrt{N+0,71}\times 7,2 = 15,12\\\\ \sqrt{N+0,71} = \dfrac{15,12}{7,2}\\\\ \sqrt{N+0,71} = 2,1\\\\ N+0,71=2,1^2\\\\ N=4,41-0,71\\\\ \boxed{N=3,7}$


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Bons estudos!