7-1 Additional Practice Adding And Subtracting Polynomials Answer Key «TOP»

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.

He imagined the crisp, boxed answers: 1. 4x² - 2x + 2. 2. -2m² + 6m + 1. The certainty of it. No more eraser shavings on his jeans. No more gnawing doubt. The subtraction was the worst

But then he remembered the day Ms. Kellar had handed back his last quiz. She hadn't just written a grade. She’d written: “Leo – you understand the idea . You just keep dropping the negative sign. Try stacking them vertically, like a tower.” He imagined the crisp, boxed answers: 1

Ms. Kellar walked back in. “Time’s up. Pass your papers forward.” -2m² + 6m + 1

He distributed the negative: 5y³ - 3y³ = 2y³. 0y² - 4y² = -4y². -2y - (-y) = -2y + y = -1y. 1 - (-6) = 7.

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 next morning, she returned the graded practice. Red checkmarks on 1, 3, 4, 5, 6… and a small, perfect check on #7.