Use the diagram to determine the length LK. A) x2 + y2 B) x2 + y2 C) (x2 - x1)2 + (y2 - y1)2 D) (x2 - x1)2 + (y2 - y1)2

D. (x2 - x1)2 + (y2 - y1)2

Step-by-step explanation:

We can use the Pythagorean Theorem or Distance formula to solve this problem. JK = x2 - x1 and LJ = y2 - y1. To find LK, you square the two legs, add them together and take the square root. The solution is  

(x2 - x1)2 + (y2 - y1)2

.

-14

step-by-step explanation:

2x2 – 2(x+4)

=2x2-2（5+4）

=4-2×9

=4-18

=-14