3 years ago

9p²-?p+49

1 answer:

Yanka [14]3 years ago

5 0

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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