Tìm x

a) To find x in the equation x^2 + (y-1/10) = 0, we need more information. The equation is in terms of x and y, so we need either the value of y or another equation involving x and y to solve for x.

b) To solve the equation (3^x - 1) * 5 * (3^x - 1) = 162, we can simplify it first.

Expanding the equation, we get:
(3^x - 1)^2 * 5 = 162

Simplifying further:
(9^x - 2 * 3^x + 1) * 5 = 162
45 * 9^x - 10 * 3^x + 5 = 162
45 * 9^x - 10 * 3^x = 157

Now, we can try to solve this equation using numerical methods or approximation techniques. It is not possible to find an exact solution algebraically.