Tiffanys constant elasticity of substitution (CES) utility function is U(q 1 , q 2 )

Question:

Tiffany’s constant elasticity of substitution (CES) utility function is U(q^ρ₁, q^ρ₂) = (q^r₁ + q^ρ₂)^1/ρ. Show that there is a positive monotonic transformation such that there is an equivalent utility function (one with the same preference ordering) U(q₁, q₂) = q^ρ₁ + q^ρ₂?