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y = x² + 4x - 5
Batas IntegraL :
x² + 4x - 5 = 0
(x + 5)(x - 1) = 0
x = -5 ; x = 1
Luas
= - ∫(x² + 4x - 5) dx [1_-5]
= -1/3 x² - 2x² + 5x
= -1/3 (1³ - (-5)³) - 2(1² - (-5)²) + 5 (1 - (-5))
= -1/3 . 126 - 2(-24) + 5 . 6
= -42 + 48 + 30
= 6 + 30
= 36 satuan luas