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Mathematics 21 Online
OpenStudy (anonymous):

(2d-5)(2d-4)=4d^2+?d+20

OpenStudy (anonymous):

expand out the left side which will give you to quadratics on either side. Bring all the terms on the same side, which will leave you with a quadratic. Then use the formula for solving quadratics, namely \[x=(-b \pm \sqrt{b ^{2}-4ac})\div 2a\]

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