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Question 13 For what values of a does the system below have nontrivial solutions? 3x+3y-2z=0 -6x+ay+4z=0 2x+4y +4z=0 a) -4 b)

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[376 +3y. -22 = 0 -63 tay+42 o [ 21 +44 +42 co - - - - ! written into matrin = 1 2 4 4 1 -6 9 ud La] To-----©- lo if Ranks of

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