разложите на родители используя формулу разности квадратов:
1)(x+2)²-49
2)(b+7)²- 100c²
3)121-(b+7)²

пример:
100-(a+5)²=10²-(a+5)²=(10-(a+5))(10+(a+5))=(10-a-5)(10+a+5)=(5-a)(15+a)​
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