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4 - x² = 0
(2+x)(2-x) = 0
pembuat nol :
2 + x = 0 ------> x = -2
2 - x = 0 -------> x = 2
Luas = int [-2,2] (4 - x²) dx
= [4x - 1/3 x³] [-2,2]
= (4(2) - 1/3 (2)³) - (4(-2) - 1/3 (-2)³)
= (8 - 8/3) - (- 8 + 8/3)
= 8 - 8/3 + 8 - 8/3
= 16 - 16/3
= (48/3 - 16/3)
= 32/3 satuan luas