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19 January, 23:07

Which expression is not a perfect square trinomial?

169-26y+y^2

81+18y+y^2

64+8y+y^2

25+10y+y^2

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  1. 20 January, 02:03
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    The answer is 64+8y+y².

    In a perfect square trinomial, you can divide the value of b by 2 and square it, and it will equal the value of c. This works in every other trinomial listed except this one:

    8/2 = 4; 4²=16≠64.
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