Question

Cần gấp, m.n ơi giúp vs

X^2căn5 - 20 =0

Answer 1

1788,854381999831757127338934985

Answer 2

\(x^2\sqrt{5}-20=0\)

\(x^2\sqrt{5}=20\)

\(x^2=\frac{20}{\sqrt{5}}\)

\(x^2=\frac{\left(\sqrt{20}\right)^2}{\sqrt{5}}\)

\(x^2=\frac{\left(2\sqrt{5}\right)^2}{\sqrt{5}}\)

\(x^2=4\sqrt{5}\)

\(x=\sqrt{4\sqrt{5}}\)

vậy \(x=\sqrt{4\sqrt{5}}\)