Find the area of the following trapezoid. 28 ft 2 17.5 ft 2 35 ft 2 14 ft 2

The answer is, "14 ft²."

You can calculate the area of a trapezoid with the following formula:

h

Add the top and bottom bases together, and divide by two.

Multiply that number by the height.

7·2

14

The area of the trapezoid is 14 ft².

The best way to improve your skill factoring this trinomials is just to practice and practice again. 
So basically we need 2 numbers that multiply to 12 and that add up to -7. Using some intuition and some guess and check, we learn that the 2 numbers are -4 and -3. Putting them into 2 binomials, we get 

(n-4)(n-3)

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