Minimizef$(x_1,x_2)=x_1-A{x}_2+b{x}_1^2+c{x}_1{x}_2+d{x}_2^2$

Use any programing language of your preference

Use constant lambda

Run optimization for three different starting points

Draw chart

$=-$ Optimality gap vs iterations

You can use Wolframalpha to explore function

Vary values of lambda

Draw chart lambda vs number of iterations