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blake647
[tex]a {}^{2} + b { }^{2} = c {}^{2} [/tex]
[tex] {7}^{2} + b {}^{2} = 14 {}^{2} [/tex]
[tex]49 + b {}^{2} = 196[/tex]
subtract 49 from both sides

[tex]b {}^{2} = 147[/tex]
take the square root of both sides
[tex]b = 7 \sqrt{3} [/tex]

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