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9p²-?p+49

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


Answer :

KEIJOSALONENIN

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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