How do you factor x squared - 14 xy - 51 y squared

The anwser cause i do not understand just plez

Anew landowner is interested in constructing a fence around the perimeter of her property. her property is 1,080√30 feet wide and 500√20 feet long. what is the perimeter of the property? (recall that the perimeter is the sum of each side of a shape or boundary). a 1,580√40 feet b. 5,320√5 feet c. 3,160√20 feet d. 10,640√5 feet

What is the approximate value of the correlation coefficient for the given graph? a. 1 b. 5 c. 3 d. -1