Find the graph of the following quadratic functions.
f\left(x\right)=x^2-5x+6\\
f\left(x\right)=x^2+2x
f\left(x\right)=-2x^2-1
f\left(x\right)=-x^2-2x -\dfrac{3}{4}
f\left(x\right)=\left(x-\dfrac{1}{2}\right)^2+\dfrac{1}{2}
f\left(x\right)=x^2-x-1
f\left(x\right)=2x^2+4x+2