Seems impossible ..

Question

If m(x) = x³ and n(x) = √ 6 + x , find the function value, if possible. (m – n)(–5) 

Answer 1

I am going to assume you mean sqrt(6+x).

(m-n)(x) = m(x) - n(x) = x³ - sqrt(6+x)

M9-n)(-5) = -125 - 1 = -126.