Let the eccentricity of the ellipse x2 / A2 + Y2 / B2 = 1 (a > b > 0) be e = 1 / 2, the right focus f (C, 0), equation a

e=c/a=1/2 c=1/2*a b^2=a^2-c^2=3/4*a^2
X1 + x2 = - B / a = - (radical 3) / 2
x1x2=-c/a=-1/2
x1^2+x2^2=(x1+x2)^2-2*x1*x2=3/4+1

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