What are the steps on how to factor the difference of squares?

The formula for the difference of squares:  a^2 – b^2 = (a + b)(a – b)

Example:  If x^2 - 4

x^2 - 2^2

(x + 2)(x - 2)

use an equation of ratios to determine the amount of gas needed to fill the tank.

    0.2             0.8

  =    

288.75             x

                                                              231 gal

so, 0.2x = (0.8)(288.75 gal), and x = = 1155 gal.

                                                                0.2

it would take 1155 gal. to fill the tank.

the cost would be

1155 gal         $3

* = $3465   (answer)

      1           1 gal

hope this you