In a topographical map of a city, the vertices of the city limits are a (10, 9), b (18, 9), c (18, 2), d (14, 4.5), and e (10, 4.5). the coordinates are measured in miles. what is the area of the city?

a4 - 3a2 - 1

step-by-step explanation:

step   1   :

equation at the end of step   1   :

  ((a4) -   3a2) -   1

step   2   :

trying to factor by splitting the middle term

2.1     factoring   a4-3a2-1  

the first term is,   a4   its coefficient is   1 .

the middle term is,   -3a2   its coefficient is   -3 .

the last term, "the constant", is   -1  

its adding 5.5 each time

step-by-step explanation: