24. Solve 2x² + x + 4 = 0 by completing the square method.
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2x2+x+4+1/4-1/4 =0
(2x2+x+1/4)+4-1/4=0
(21/2x+1/2)2+15/4=0
21/2x+1/2=-151/2/2
x=151/2-1/221/2
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