12-16-8x+x^2=3x^2-x^2
-4-8x+x^2-3x^2+x^2=0
x^2-8x-4=0
D=64-4×1×-4=64+16=80
x1=8+√80/2=8+4√5/2=6√5
x2=8-4√5/2=2√5
Ответ: x1=6√5,x2=2√5
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12-16-8x+x^2=3x^2-x^2
-4-8x+x^2-3x^2+x^2=0
x^2-8x-4=0
D=64-4×1×-4=64+16=80
x1=8+√80/2=8+4√5/2=6√5
x2=8-4√5/2=2√5
Ответ: x1=6√5,x2=2√5