Finding the Difference
Find the difference of two polynomials:
Step 1 — Distribute the subtraction and identify like terms: The subtraction sign in front of the second polynomial acts as multiplication by , changing the sign of every term inside: . The expression becomes:
The -terms are and ; has no like-term partner; the constants are and .
Step 2 — Rearrange the terms: Group like terms together:
Step 3 — Combine like terms: gives ; remains unchanged; .
The difference is .
The key step that distinguishes polynomial subtraction from addition is distributing the negative sign across the polynomial being subtracted, which flips every term's sign before like terms are combined.
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