1) Write the quadratic equation whose roots are 5 and 4, and whose leading coefficient is 1.(Use the letter x to represent the variable.)

2) Write the quadratic equation whose roots are 1 and 2, and whose leading coefficient is 2.

3) If the graph of the function g defined by =gx+−5×24 is translated vertically upward by 3 units, it becomes the graph of a function f.

Find the expression for fx.