857 Вправа 857Алгебра 8 клас Бевз 2025 · § 17 · стор. 162

857. The function is given by the formula y = √x. Find the value of: a) the function if the argument value is equal: 9; 25; 1,21; 0,04; 4900; b) the argument if the function value is equal: 1; 0,3; 1,2; 15.

a) ${\displaystyle y=}$${\displaystyle \sqrt{x}}$:

b) ${\displaystyle x=}$${\displaystyle y^2}$:

${\displaystyle y=}$${\displaystyle 1}$ — ${\displaystyle x=}$${\displaystyle 1^2=}$${\displaystyle 1}$;

${\displaystyle y=}$${\displaystyle 0,3}$ — ${\displaystyle x=}$${\displaystyle 0,3^2=}$${\displaystyle 0,09}$;

${\displaystyle y=}$${\displaystyle 1,2}$ — ${\displaystyle x=}$${\displaystyle 1,2^2=}$${\displaystyle 1,44}$;

${\displaystyle y=}$${\displaystyle 15}$ — ${\displaystyle x=}$${\displaystyle 15^2=}$${\displaystyle 225}$.