Question

Помогите 4 и 6!!!!!!

Answer 1

4.
$a) : : frac{1}{3} {b}^{3} times 3( - b) = - {b}^{4} \ b) : : 2 {x}^{2} frac{7}{x} = 14x$
6.
$sqrt{x} > 0 \ sqrt{x} = 2 \ x = 4$
[0;4) и (4;. + бесконечность)