Respostas

2014-08-22T12:26:27-03:00
4y^4 -16y²+16=25
4y^4 - 16y² +16-25=0
4y^4 - 16y² - 9 = 0
1 5 1
2014-08-22T12:27:02-03:00
Vamos lá !
 (2y^{2} - 4)^{2} = 25\\\\
\sqrt{ (2y^{2} - 4)^{2}} = \sqrt{25} \\\\
2y^{2} - 4 = 5\\\\
2y^{2} = 9\\\\
 \sqrt{2y^{2}} =  \sqrt{9} \\\\
 \sqrt{2} y = 3\\\\
\boxed{y =  \frac{3 \sqrt{2} }{2} }


4c² - 9 Sobre C²= 35 ?? Obrigado Amigo