Soal Kumon Level H <AUTHENTIC>

x + 3 = 0 → x = -3

Then the magic trick: if the product is zero, one of the factors must be zero.

Problem 8: x² - 4x - 12 = 0 . Multiply to -12, add to -4? -6 and +2. (x - 6)(x + 2) = 0 → x = 6, x = -2.

“Ready,” she said. And for the first time, she meant it. soal kumon level h

She picked up her pencil.

(x + 2)(x + 3) = 0.

She checked her work. (-2)² + 5(-2) + 6 = 4 -10 + 6 = 0. Yes. Her heart did a small leap. x + 3 = 0 → x =

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.

Her pencil hovered over problem number 7: x² + 5x + 6 = 0 . The numbers felt like a foreign language. Her mother, sitting two chairs away, was scrolling on her phone, occasionally glancing over. No help. That was the Kumon rule.

Rina looked at the first problem. A quadratic with a leading coefficient greater than one: 2x² + 7x + 3 = 0 . -6 and +2

Rina smiled. “Done.”

What two numbers multiply to 6 and add to 5? 2 and 3.