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(7a2−63b2)=?(a) (7a−9b)(9a+7b)(b) (7a−9b)(7a+9b)(c) 9(a−3b)(a+3b)(d) 7(a−3b)(a+3b) |
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Answer» (7a2−63b2)=?(a) (7a−9b)(9a+7b)(b) (7a−9b)(7a+9b)(c) 9(a−3b)(a+3b)(d) 7(a−3b)(a+3b) |
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