If the projection of the two intersection points of the straight line y = 22x and the ellipse x2a2 + y2b2 = 1, a > b > 0 on the X axis is exactly the two focal points of the ellipse, then the eccentricity e of the ellipse is equal to () A. 32B. 22C. 33D. 12

If the projection of the two intersection points of the straight line y = 22x and the ellipse x2a2 + y2b2 = 1, a > b > 0 on the X axis is exactly the two focal points of the ellipse, then the eccentricity e of the ellipse is equal to () A. 32B. 22C. 33D. 12

By substituting m into the elliptic equation, c2a2 + 12c2b2 = 1, B2 = a2-c2, which is reduced to 2c4-5a2c2 + 2a4 = 0, ∵ 2e4-5e2 + 2 = 0, ∵ 2e2-1) (E2-2) = 0, ∵ 0 < e < 1, ∵ 2e2-1 = 0, and the solution is e = 22