Собственно математика 10 класса

Собственно понятно

1. (8^(1/6) )^2 = 8^(1/3) = (2^3)^(1/3) = 2

3. a
sqrt(7-x^2) = sqrt(-6x)
7-x^2 = -6*x
x^2 - 6*x - 7 = 0 -> x1 =7; x2=-1;

c. 3^(3+x) + 3^x = 5*2^(x+4) - 17*2^x
(27+1)*3^x = (5*16 - 17)*2^2
28*3^x = 63*2^x
4*3^x = 9*2^2
4/9 = (2/3)^x -> x = 2