what is the answers

what is the answers c \ven *Bilis

a)
40 - x metre 

b)
Length of side of square made by the rope of x metre: x / 4 metre 
Length of the side of the other square: (40 - x) / 4 metre 

c)
(x / 4)² + ((40 - x) / 4)² = 58 

d) 
(x / 4)² + ((40 - x) / 4)² = 58 
(x² / 16) + ((1600 - 80x + x²) / 16) = 58 
(x² + 1600 - 80x + x²) / 16 = 58 
(2x² + 1600 - 80x) / 16 = 58 
2x² - 80x + 1600 = 58 imes 16 = 928 
2x² - 80x + 1600 = 928 
2x² - 80x = 928 - 1600 
2x² - 80x = -672
x² - 40x = -672 / 2 
x² - 40x = -336 
x² - 40x + 400 = -336 + 400 
(x - 20)² = 64 
x - 20 = \sqrt{64} 
x - 20 = \pm 8 

x = 8 + 20
x = 28 

OR 

x = - 8 + 20 
x = 12 

herefore\ Lengths of the pieces are 12 m and 28 m.