how to make "k" and "m" subject of the formula

Question

Make k the subject of the formula: P= √k−1 ÷ √k+1 P=sqaure root of k-1 ÷ sqaure root of k+1 Make m the subject of the formula: I= mnE ÷ mR+nr

Answer 1

(1).

Equation : and solve for k.

Answer 2

(2).

Equation : and solve for m.