Question

resolva a equação do 2° grau

y²-5=15​

Answer 1

Resposta:

$y^2-5=15\\\\y^2-5+5=15+5\\\\y^2=20\\\\y=\sqrt{20}\\\\\:y=-\sqrt{20}\\\\y=2\sqrt{5}\\\\\:y=-2\sqrt{5}$

Answer 2

Resposta:

y1 = -4,47214

y2= 4,47214

Explicação passo a passo:

y²-5=15​

y²=15+5=20

y= $\frac{+}{-}$$\sqrt{5\\}$

y= -2$\sqrt{5\\}$ = y1= -4,47214

y= 2$\sqrt{5\\}$ = y2= 4,47214