1.
a. \(x^2-4x\Rightarrow x^2-4x+4=\left(x-2\right)^2\)
b. \(x^2+9\Rightarrow x^2+9+6x=\left(x+3\right)^2\)
c. \(x^2+xy+y^2\Rightarrow x^2+xy+y^2+xy=\left(x+y\right)^2\)
d. \(x^2-x\Rightarrow x^2-x+\dfrac{1}{4}=\left(x-\dfrac{1}{2}\right)^2\)
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