A. (-∞,1-√2][1+√2,∞)
B. R
C. (-1,1/2)
D. [-1,1/2]
If the product of the roots of the equation 5x2-4x+2+k(4x2-2x-1)=0 is 2,then k=
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If the roots of x2+bx+c=0 are two consecutive integers then b2-4c=