If 2^(x−1) + 2^(x+1) = 1280, then the value of x²+9x is

If x + (1/y) = 1 and y + (1/z) = 1, then the value of z + (1/x) is

If x + 1/x = k and x² + 1/x² = k, then values of k are

If x^3 – y^3 = 117/8 and x – y = 3/2 then the value of x^2 + xy + y^2 will be

If 2^(2x−1) + 4^x = 2^(x−1/2) + 2^(x+1/2), then the ratio (1−x)/(1+x) is

If z = x + iy is a complex number such that iz = 2 + 3i, then the value of x − y is