You'll see what I mean if you paste the following two expressions into https://www.desmos.com/calculator and compare their plots:
y=\left[1...4\right]x-\left[0...3\right]^{2} yx=\left[1...4\right]x-\left[0...3\right]^{2}
You'll see what I mean if you paste the following two expressions into https://www.desmos.com/calculator and compare their plots: