668 Вправа 668Алгебра 8 клас Бевз 2025 · § 13 · стор. 129

668. Розв’яжи рівняння.

а) ${\displaystyle 5\sqrt{y}=}$${\displaystyle 10}$;

${\displaystyle \sqrt{y}=}$${\displaystyle 10:5}$;

${\displaystyle \sqrt{y}=}$${\displaystyle 2}$;

${\displaystyle y=}$${\displaystyle 2^2}$;

${\displaystyle y=}$${\displaystyle 4}$;

б) ${\displaystyle -3+\sqrt{y}=}$${\displaystyle 0}$;

${\displaystyle \sqrt{y}=}$${\displaystyle 3}$;

${\displaystyle y=}$${\displaystyle 3^2}$;

${\displaystyle y=}$${\displaystyle 9}$;

в) ${\displaystyle 4\sqrt{z}=}$${\displaystyle 8}$;

${\displaystyle \sqrt{z}=}$${\displaystyle 8:4}$;

${\displaystyle \sqrt{z}=}$${\displaystyle 2}$;

${\displaystyle z=}$${\displaystyle 2^2}$;

${\displaystyle z=}$${\displaystyle 4}$.