Разложи на множители:

9t2+42t+49.

 

Выбери все возможные варианты:

 

(3t+7)⋅(3t+7)

(3t+7)⋅(3t−7)

(3t−7)2

(3t−7)⋅(3t−7)
умоляю помогите ((​
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