8 Test file number 19

  8.1 Problem number 424
  8.2 Problem number 425
  8.3 Problem number 426

Test folder name:

test_cases/1_Algebraic_functions/1.1_Binomial_products/1.1.2_Quadratic/19_1.1.2.2-c_x-^m-a+b_x^2-^p