Question: For exercise 1, should I use reduced row echelon from? Or just to proof that the first two vectors can form the third one, so
For exercise 1, should I use reduced row echelon from? Or just to proof that the first two vectors can form the third one, so that the basis are the first two.

Exercise 1 (10 points). (1) Find a basis of the span of (1 2H: m: a) in M2(R). (2) For What values of t E R are the vectors 1 1 75 \"(L1 = 1 ,U2 = 1 {(13 = 2 0 1 1 linearly independent in R3
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