Two sides of a four sided figure have negative slopes which are the endpoints of the sides of this figure
(-4,-4) (-4,-1) (-1, -4) (-1,-1)

-2,-4 (-1 -1), (1,-1) , (2 -4)

1,1 (2,4) (5, 4)( 4,1)

(1,4), (2,1) (5,1) (4,4)

a complex number is a number that can be expressed in the form a + bi, where a and b are real numbers, and i is a solution of the equation x2 = −1. because no real number satisfies this equation, i is called an imaginary number. has no real solution, since the square of a real number cannot be negative.