Question

Is `y=(x-1)(x-2)` a quadratic?

Answer 1

`y = (x-1)(x-2)`
can be written in an equivalent form as
`color(white)("XXXXX")` `y=x^2-3x+2`

which is in the standard quadratic form `y=a^2+bx+c`

so `y=(x-1)(x-2)` is a quadratic.