Try another version of this question Compute: `3[(2,-9),(-9,1)] + 2[(-9,3),(-9,9)]` `[(-7,-6),(-18,10)]` `[(-35,-30),(-90,50)]` `[(-12,-21),(-45,21)]` `[(-2,-1),(-13,15)]` Get help: VideoBox 1: Select the best answer `[(-12,-21),(-45,21)]`
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Box 1: Select the best answer