completing square method: 2x²-7x+3=0
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2x^2-7x+3 = 0
2(x^2-7/2x)+3 = 0
2(x^2-2*7/4x+49/16) = 49/8-3 = 25/8
(x-7/4)^2 = 25/16
x-7/4= +- 5/4
therefore x = 7/4+- 5/4 = 3 or 1/2
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