Tìm cực trị của hàm số

z = y² - 2x²y + 2x² + y²-y.

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)

What is the solution set of the quadratic inequality x^2-5< or equal to 0

Elizabeth claims that the fourth root of 2 can be expressed as 2^m since (2^m)^n = 2. find the values of m and n for the case where elizabeth's claim is true.