Please show all work:

1)find the integers whose square is 36 more than 5 times itself

2) If x² is added to 7x, the sum is -12.What are possible values of x?

3)The area of a rectangle is 84 square inches. The length is 5 inches more than the width.Find the rectangle's length.

4) The area of a rectangle is 40 square meters. The width is 6 meters less than the length.Find the rectangle's width and length.