Question

x^2=30y^2 +1

Answer 1

\(x^2-1=30y^2\)

\(\dfrac{x^2-1}{30}=y^2\)

\(\dfrac{\left(x+1\right)\left(x-1\right)}{30}=y^2\)

\(\pm\sqrt{\dfrac{\left(x+1\right)\left(x-1\right)}{30}}=y\)

\(y=\pm\sqrt{\dfrac{\left(x+1\right)\left(x-1\right)}{30}}\)

sai thông cảm!

Answer 2

\(x=\pm\sqrt{30y^2+1}\)