factorise [4a +2b]x^2+ [4a+b]^2 x + 2ab(a+b) = 0
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16a^2+4b^2+16ab+16a^2+b^2+8ab+2a^2b+2ab^2
=32a^2+5b^2+24ab+2a^2b+2ab^2
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