4a^2 - 49b^2 + 2a - 7b factorise
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4a^2 - 49b^2 + 2a - 7b
=4a^2+2a-49b^2-7b
=2a (2a+1)-7b (7b+1)
=4a^2+2a-49b^2-7b
=2a (2a+1)-7b (7b+1)
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see attachment...hope it will help u
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