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If x²+10x is to be shown by completing a square visually, which corner must be added?

Answer and explanation

Correct answer: 25

The correct answer is D: 25. In a visual completion-of-square model, the middle term 10x is formed by two equal strips. Each strip must therefore have coefficient 5x, because 5x+5x=10x. The missing corner has side lengths 5 and 5, so its area is 5×5=25. Algebraically, x²+10x+25=(x+5)². Option A is only half of the middle coefficient and gives a length, not the corner area. Option B uses the full coefficient without halving. Option C doubles the coefficient and has no matching square construction. Option D correctly squares half of 10. Memory cue: for x²+bx, add (b/2)²; always halve the coefficient of x before squaring.

Related tags

Completing The SquareVisual ModelQuadratic ExpressionPerfect SquareVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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