Essay

Verification of Square Deck Dimensions

A residential remodeling apprentice is verifying the blueprint of a square backyard deck. The blueprint lists the total deck area as 49x2+84xy+36y2{}49x^2 + 84xy + 36y^2 square feet. To confirm that the deck is a perfect square and determine its side length, the apprentice must factor this area expression from memory.

Write a short essay that explains how to factor this area expression using the perfect square trinomial pattern. In your explanation, address the following from memory:

  1. State the algebraic pattern/formula for a positive perfect square trinomial.
  2. Identify the algebraic expressions for aa and bb based on the first term 49x2{}49x^2 and the last term 36y2{}36y^2.
  3. Verify that the middle term 84xy{}84xy matches the 2ab{}2ab requirement of the pattern.
  4. State the final factored expression of the area, and specify the binomial that represents the actual side length of the deck.

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Updated 2026-06-18

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