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Geometry Level 3

If the foci of the ellipse x225+y29=1 \large \frac{x^2}{25}+\frac{y^2}{9}=1 are (4,0) (4,0) and (4,0)(-4,0), then for real number λ\lambda, the foci of the ellipse x225+λ2+y29+λ2=1 \large \frac{x^2}{25+ \lambda^2}+\frac{y^2}{9+\lambda^2}=1 are:

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