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

Slowly, deliberately, Leo turned the page of his own notebook. He crossed out his first attempt on problem #7. He rewrote the subtraction vertically, aligning the like terms:

The answer key for “7-1 Additional Practice: Adding and Subtracting Polynomials” sat face-down on Ms. Kellar’s desk, a silent judge. Slowly, deliberately, Leo turned the page of his

The next morning, she returned the graded practice. Red checkmarks on 1, 3, 4, 5, 6… and a small, perfect check on #7. Kellar’s desk, a silent judge

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

The subtraction was the worst. His friend Mia had whispered, “Just distribute the minus sign, Leo. Like a negative love letter.” But Leo kept forgetting to flip the last sign.

The answer key would give him the what . But it wouldn't fix the why .