dibantu ya. sm caranya no 37

jawab

y = x² + 4x
y = x + 4.........(-)
0 = x²  + 3x - 4
atau
x² + 3x - 4= 0
a= 1
b = 3
c = -4

D= b²-4ac
D = 3² - 4(1)(-4)
D = 25

Luas  = D√D/ (6. a²)

L = 25√25/ (6. 1)
L = 125/6
L =  20 ⁵/₆