algebra

[input]solve( a+b = 5, a*b = 4)[/input]

{a=4, b=1, a=1, b=4}
[input]a=4; b=1; a^2 + b^2[/input]
[input]a=1; b=4; a^2 + b^2[/input]
[input]a=4; b=1; a^4+ b^4[/input]
[input]a=1; b=4; a^4+ b^4[/input]