https://www.khanacademy.org/math/precalculus/x9e81a4f98389efdf:conics/x9e81a4f98389efdf:hyperb-foci/v/foci-of-a-hyperbola 2021-03-19T16:21:24Z Foci of a hyperbola from equation Sal discusses the foci of hyperbolas and shows how they relate to hyperbola equations. Sal Khan video https://cdn.kastatic.org/googleusercontent/fN5xNEwDo7pABBo-PQVKZcs8fLgu9rFMFTSrHmvDyAHXKycHCAM8e5YS5-tCZmXF6JtwrXfVQ8WaMIHLa9rtgoo Foci of a hyperbola from equation Sal discusses the foci of hyperbolas and shows how they relate to hyperbola equations. https://cdn.kastatic.org/ka-youtube-converted/S0Fd2Tg2v7M.mp4/S0Fd2Tg2v7M.mp4 924 Foci of a hyperbola https://www.khanacademy.org/math/precalculus/x9e81a4f98389efdf:conics/x9e81a4f98389efdf:hyperb-foci/e/foci-of-hyperbola-from-equation 2026-04-08T00:36:09.500768563Z Foci of a hyperbola from equation Given the equation of a hyperbola, find its foci. Sid Patel exercise https://www.khanacademy.org/math/precalculus/x9e81a4f98389efdf:conics/x9e81a4f98389efdf:hyperb-foci/e/equation_of_a_hyperbola 2026-05-05T18:10:50.367167117Z Equation of a hyperbola from features Given some features of a hyperbola, find its equation. Sid Patel exercise https://www.khanacademy.org/math/precalculus/x9e81a4f98389efdf:conics/x9e81a4f98389efdf:hyperb-foci/v/proof-hyperbola-foci 2021-03-19T16:21:24Z Proof of the hyperbola foci formula Sal proves why, for the general hyperbola equation x^2/a^2-y^2/b^2=1, the focal length f forms the equation f^2=a^2+b^2 with the parameters a and b. Sal Khan video https://cdn.kastatic.org/googleusercontent/PUjlqqxwBg_ErIeP7_FS0eivS2jrePh43deQ75n552tuS64s8ZH6OxXhM22pteNTUyNfklc4yXhIa1qmR0orTijarw Proof of the hyperbola foci formula Sal proves why, for the general hyperbola equation x^2/a^2-y^2/b^2=1, the focal length f forms the equation f^2=a^2+b^2 with the parameters a and b. https://cdn.kastatic.org/ka-youtube-converted/HPRFmu7JsKU.mp4/HPRFmu7JsKU.mp4 890 Foci of a hyperbola