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1. a, căn bậc 2 của 2x^2-9=-x b, căn bậc 2 của 5x+3=căn bậc 2 của 3 - căn bậc 2 của 2 c, căn bậc 2 của (căn bậc 2 của x-7) căn bậc 2 của x+7 =2 d, căn bậc 2 của căn bậc 2 của 5- căn bậc 2 của 3 = căn bậc 2 của 8+2 căn bậc 2 của 15
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