Programming

Input: $,x,y,$

Output: $x^2-y^2$

Input: $a,b$

Output: $,|c|=|a+bi|=\sqrt[\phantom{2}]{a^2+b^2}$

Do not use direct build$-$in function.

solve equation $,x^2-2px+q=0$

Input: $,p,q$

Output: $x_1,x_2$

Given $2-$dim array $($matrix$)$ A and $B,$ Find $C=A+B$ Input matrix: $,$A and $B,($same size$)$