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x² - 4x - 5 = 0
(x + 1)(x - 5) = 0
x = -1 atau x = 5
Luas = int [-1 s.d 5] (x² - 4x - 5) dx
= (1/3)x³ - 2x² - 5x [-1 s.d 5]
= ((1/3)(125) - 2(25) - 25)) - ((1/3) - 2 + 5))
= (125/3 - 75) - (1/3 + 7)
= -124/3 - 82
= -124/3 - 246/3
= -370/3
Luasnya 370/3 (minus karena dibawah sb.x)