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05-05-2021
Mathematics

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9p²-?p+49

In order for the following expression to be a perfect square trinomial, fill in the missing number

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keijosalonen keijosalonen

05-05-2021

Answer: ? = 42

Step-by-step explanation:

(a-b)² = a² - 2ab + b². From 9p² -?p + 49 we see

9p² = (3p)² and 49 = 7² Then Middle term is -2·(3p)·7 = -42p

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