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If y², 8y, and 16 together form a perfect square in a visual model, what is the outer side?

Answer and explanation

Correct answer: y+4

The direct answer is option B: y+4. A square model with outer side y+4 can be divided into a y by y square, two rectangles measuring y by 4, and a 4 by 4 corner square. Their areas are y², 4y, 4y, and 16. Adding them gives y²+4y+4y+16=y²+8y+16, exactly the three given parts. Therefore, the side is y+4. Option A, y+8, incorrectly treats the complete middle coefficient 8 as a side length; its square would contain 16y as the middle term. Option C, y−4, gives y²−8y+16, so the sign of the middle term is wrong. Option D, y+16, treats the corner area as though it were a length. A useful memory cue is: in a²+2ab+b², the outer side is a+b, and the last term is the square of the smaller side.

Related tags

Perfect SquareVisual ModelAlgebraic IdentityVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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