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Explain how to subtract one polynomial from another. What extra step is needed compared to adding polynomials?
Question: Explain how to subtract one polynomial from another. What extra step is needed compared to adding polynomials?
Sample answer: To subtract polynomials, first change the sign of every term in the polynomial being subtracted. This turns the problem into an addition problem. Then combine like terms by adding their coefficients, keeping the variable part the same. The extra step compared to addition is distributing the subtraction sign across every term of the second polynomial before combining like terms.
Key points:
- Distribute the subtraction sign across every term of the second polynomial
- Changing signs is the same as multiplying each term by -1
- After signs are changed, combine like terms as in addition
- Like terms have the same variable(s) raised to the same exponent(s)
Rubric: Full credit: mentions changing the sign of every term in the subtracted polynomial, then combining like terms. Partial credit: mentions only one of these steps. No credit: describes addition only or gives an unrelated answer.
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