book Maths Puzzle Numerical Ability

1/3 x 50 =

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An (n,k,d) code with generator matrix G=[I|A], where A is a k x (n-k) matrix, is MDS (Maximum distance separable) if and only if every square submatrix (formed from any i rows and Hi all,
One more question and I should be about done with algebra for awhile. The directions here say to solve for the roots.
p^2+15p+25=6p+5
I have no clue how to do this.
Thanks for the help