Question

6. Решите уравнение: 1/3 * sqrt(x) - 1 = 2

Answer 1

$\displaystyle\bf\\\frac{1}{3} \sqrt{x} -1=2\\\\\\\frac{1}{3} \sqrt{x} =3\\\\\\\sqrt{x} =3:\frac{1}{3} =3\cdot3=9\\\\\\(\sqrt{x} )^{2} =9^{2} \\\\\\x=81$