So Rina breathed out. She looked at x² + 5x + 6 again. She drew her two parentheses: ( _ + _ )( _ + _ ).
What two numbers multiply to 6 and add to 5? 2 and 3. soal kumon level h
Problem 8: x² - 4x - 12 = 0 . Multiply to -12, add to -4? -6 and +2. (x - 6)(x + 2) = 0 → x = 6, x = -2. So Rina breathed out
She was no longer guessing. She was dancing. Each problem unlocked the next. By problem 15, she was solving perfect squares without even writing the middle step. By problem 20, the word “impossible” had left her mind entirely. soal kumon level h