в) 4√4 + 3x = -1 ;

в) $$4√4 + 3x = -1$$.

$$4\sqrt[4]{4 + 3x} = -1 \implies \sqrt[4]{4 + 3x} = - \frac{1}{4} \implies 4 + 3x = \frac{1}{256} \implies 3x = \frac{1}{256} - 4 = \frac{1 - 1024}{256} = - \frac{1023}{256} \implies x = - \frac{341}{256}$$.

Ответ: $$- \frac{341}{256}$$