7-1 Additional Practice Adding And Subtracting Polynomials Answer Key -

At the top, in blue ink, she had written: “You found the tower. +1 extra credit for honesty. I saw you look at the key and choose not to flip it.”

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. At the top, in blue ink, she had

Ms. Kellar walked back in. “Time’s up. Pass your papers forward.” The real answer key wasn’t on a separate sheet of paper

To Leo, it wasn’t a sheet of paper. It was the wall between a C- and a B+. He’d spent forty-five minutes wrestling with problems like “Add: (3x² + 2x - 5) + (x² - 4x + 7)” and the soul-crushing “Subtract: (5y³ - 2y + 1) - (3y³ + 4y² - y - 6).” Kellar walked back in

(5y³ + 0y² - 2y + 1) -(3y³ + 4y² - y - 6)