中四數學~function

首先想問下點先叫做polynomial? 可唔可以list幾個例子

之後想問下quadratic equation/ function

"an equation in the form ax^2+bx+c=0, where a,b, c are real numbers and a≠0, is a quadratic equation in one unknown x"

"A funtion in the form y=ax^2+bx+c or f(x)=ax^2+bx+c where a, b and c are constants and a≠0 is called a quadratic function of x"

想問下點解quadratic equation 係 where a,b,c are real no. 而 function 係where a,b,c are constants ge???

function transformation個part
點解個graph向左移係f(x+k), 向右移係f(x-k)?