Using the completing-the-square method, rewrite f(x) = x2 − 6x + 2 in vertex form.

f(x) = (x − 3)2
f(x) = (x − 3)2 + 2
f(x) = (x − 3)2 − 7
f(x) = (x − 3)2 + 9

Sera sells t-shirts at the beach. she believes the price of a t-shirt and the number of t-shirts sold are related. she has been experimenting with different prices for the t-shirts. she has collected a data set with five pairs of data; each consists of the price of a t-shirt and the number of shirts sold. the independent variable, which will go on the x-axis, is . the dependent variable, which will go on the y-axis, is the