His hand hovered.
(5y³ + 0y² - 2y + 1) -(3y³ + 4y² - y - 6)
The next morning, she returned the graded practice. Red checkmarks on 1, 3, 4, 5, 6… and a small, perfect check on #7. His hand hovered
He distributed the negative: 5y³ - 3y³ = 2y³. 0y² - 4y² = -4y². -2y - (-y) = -2y + y = -1y. 1 - (-6) = 7.
The answer key for “7-1 Additional Practice: Adding and Subtracting Polynomials” sat face-down on Ms. Kellar’s desk, a silent judge. He distributed the negative: 5y³ - 3y³ = 2y³
Now, during the last five minutes of class, Ms. Kellar had stepped into the hall to take a call. The answer key was right there. One quick flip. A single glance.
The answer key would give him the what . But it wouldn't fix the why . 1 - (-6) = 7
Leo smiled. The real answer key wasn’t on a separate sheet of paper. It was in the careful, error-by-error process of building his own.