book Maths Puzzle Numerical Ability

Simplify (5c-7)(-3)

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book Other Question

Simplify x^2-2x-35/2x^2+10x Let T be a linear operator on a finite-dimensional vector space V, and let
b (beta) be an ordered basis for V. Prove that l (lamda) is an eigenvalue of T if and only if l (lamda) is an eigenvalue of [T]b (beta).