21 Test file number 38

  21.1 Problem number 58
  21.2 Problem number 67

Test folder name:

test_cases/1_Algebraic_functions/1.2_Trinomial_products/1.2.1_Quadratic/38_1.2.1.9_P-x-d+e_x-^m-a+b_x+c_x^2-^p