solve the questions plz
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25a^2-4b^2+28bc-49c^2 can be written as
=(5a)^2-[(2b)^2+(7c)^2- 2×2b×7c]
=(5a)^2-(2b-7c)^2
=[5a-(2b-7c)]×[5a+(2b-7c)]
=(5a-2b+7c)(5a+2b-7c)
Hope it helps
=(5a)^2-[(2b)^2+(7c)^2- 2×2b×7c]
=(5a)^2-(2b-7c)^2
=[5a-(2b-7c)]×[5a+(2b-7c)]
=(5a-2b+7c)(5a+2b-7c)
Hope it helps
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