Question

1y×y-20=0
Qual a resposta?

Answer 1

Resposta:

$y\times y -20=0 \Rightarrow y^2-20=0\\\\\Rightarrowy^2=20 \Rightarrow y =\pm \sqrt{20}=\pm2\sqrt{5} \Rightarrow y=2\sqrt{5}\ ou\ y=-2\sqrt{5}$

Answer 2

Oie, Td Bom?!

>>> Resolvendo a expressão.

$1y \: . \: y - 20 = 0$

$y \: . \: y - 20 = 0$

$y {}^{2} - 20 = 0$

$y {}^{2} = 20$

$y = ± \sqrt{20}$

$y = ± \sqrt{2 {}^{2} \times 5}$

$y = ± \sqrt{2 {}^{2} } \sqrt{5}$

$y = ±2 \sqrt{5}$

$y = - 2 \sqrt{5} \\ y = 2 \sqrt{5}$

S [ $y_{1} = - 2 \sqrt{5} \: , \: y_{2} = 2 \sqrt{5}$ ]

Att. Makaveli1996