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Maka,
Integral luas.
= int[-1.4] (-x²+4x+12)-(x²-2x+4) dx
= int[-1,4] -2x²+6x+8 dx
= -2/3 x³ + 3x² + 8x ]₋₁⁴
= -2/3 (4³-(-1)³) + 3(4²-(-1)²) + 8(4-(-1))
= -2/3 (65) + 3(15) + 8(5)
= -130/3 + 45 + 40
= -130/3 + 85
= (-130+255)/3
= 125/3 satuan luas
= 41 2/3 satuan luas