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  1. B

    Intersection of a line and circle

    Homework Statement The line x+y=2a-1 intersects the circle x2+y2=a2+3a-3 at point (m,n). When m*n reaches its minimum value, what is the value of a?Homework Equations Equation One x + y = 2a - 1 Equation Two x2 + y 2 = a 2 + 3a - 3