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How can you tell that x2 - 19x + 90 is not a perfect square trinomial?

How can you tell that x2 - 19x + 90 is not a perfect square trinomial?
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5 votes
How can you tell that x2 - 19x + 90 is not a perfect square trinomial?

User RockerBOO
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1 Answer

5 votes
Because 19 is a prime number
User Anand Jha
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8.3k points
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