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Mathematics 17 Online
OpenStudy (anonymous):

.7x^2-4.2x-.7=0

OpenStudy (phi):

First simplify by multiplying by 10 (all terms) then divide by 7 (or divide by 0.7)

OpenStudy (phi):

then use the quadratic formula

OpenStudy (phi):

see http://www.purplemath.com/modules/quadform.htm

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