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Pls anwer this qestion it is worth 30 points

Pls Anwer This Qestion It Is Worth 30 Points class=

Sagot :

Answer:

49

Step-by-step explanation:

25b² + 70b + ....

( 5b + 7)² = 5×5b² + 2×5×7b + 7×7 = 25b² + 70b + 49

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