bantu kk mntk tlong banget

27)
f(x) = -x² + 4x + 12
g(x) = x² - 2x - 8

f(x) = g(x)
-x² + 4x + 12 = x² - 2x - 8
-x² - x² + 4x + 2x + 12 + 8 = 0
-2x² + 6x + 20 = 0

a = -2
b = 6
c = 20

selanjutnya cari deskriminan

D = b² - 4ac
D = 36 - 4 (-2)(20)
D = 36 - (-160)
D = 36 + 160
D = 196

luas = D √D / 6a²
luas = 196 √196 / 6(-2)²
luas = 196(14) / 6(4)
luas = 2744 / 24
luas = 114 8/24
luas = 114 1/3 satuan luas (jawabannya B)