Find A^−1 modulo 26.

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Find A^−1 modulo 26.

|4 9 15 |

|15 17 6|

|24 0 17|

i know i will have to do something like this

|4 9 15 | * | 1 0 0 |

|15 17 6| * | 0 1 0 |

|24 0 17| * | 0 0 1 |

Also if the product of the multiplication equals more then 26 i will have to mod 26 it

THE Problem is 5C)

https://cdn.discordapp.com/attachments/328208536029102081/368955436486885376/JPEG_20171014_225708.jpg

Heres my work https://cdn.discordapp.com/attachments/328208536029102081/368955533199409153/Message_1508035936311.jpg