Ответ:

  1. \(x^2-10x+10=(x-5)^2-15\).
  2. \(x^2+3x-1=\left(x+\frac32\right)^2-\frac{13}{4}\).
  3. \(3x^2+6x-3=3(x^2+2x-1)=3(x+1)^2-6\).
  4. \(\frac14x^2-x+2=\frac14(x^2-4x+8)=\frac14(x-2)^2+1\).