39 , mohon bantuan teman

y = x² + 2x - 8
batas sb x ---> y = 0

x² + 2x - 8 = 0
a = 1
b = 2
c = -8

D = b² - 4ac = 36

Luas
= D√D /6a²
= 36√36 / 6
= 36 satuan luas