If \(t=-5k,\) what is \(t^2-2t\) in terms of \(k?\)

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If \(t=-5k,\) what is \(t^2-2t\) in terms of \(k?\)

(A) \(25k^2+10k\)

(B) \(25k^2-10k\)

(C) \(5k^2+10k\)

(D) \(-5k^2+10k\)

(E) \(-5k^2-10k\)

Answer: A

Source: GMAT Prep