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In a visual model, x² + 12x + 36 can be seen as which perfect square?

Answer and explanation

Correct answer: (x+6)²

The direct answer is B, (x+6)². Use the pattern (x+a)² = x² + 2ax + a². The constant term is 36, whose square root is 6, so the last part suggests a = 6. The middle term then becomes 2×x×6 = 12x, exactly the middle term in the expression. Therefore x² + 12x + 36 = (x+6)². In a visual model, x² is the large square, 6x and 6x are two equal rectangles, and 36 is the small 6-by-6 square. Option A, (x+12)², would expand to x² + 24x + 144, so both the middle and constant terms are wrong. Option B matches every term. Option C, (x−6)², expands to x² − 12x + 36; its middle term has the wrong sign. Option D, (x+3)², gives x² + 6x + 9, so its numbers are too small. Memory cue: take the square root of the constant and use half of the middle coefficient to confirm the sign.

Related tags

Algebraic IdentitiesPerfect SquareTrinomialsVisual ModelsVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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