Question

Please solve the quadratic equation by factorisation method:
x² + ( a/a+b + a+b/a)x + 1 =0

Answer 1

In the second step,
the x outside the bracket in first step is multiplied with each term inside the bracket.
in the third step ,1 is replaced by the term ((a+b)/a)*(a/(a+b)) which itself is equal to 1,so that we can arrice at the answer more simply.