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4. a. h = 30t - 5t²
= 30(3) - 5(3)²
= 90 - 45
= 45 m
b. 30t - 5t² = 5t(6 - t)
pembuktian = 5t(6 - t)
= 5(3) (6 - 3)
= 15 (3)
= 45 m (ternyata hasilnya sama dgn. yg a)
5. (2 - 2b)⁵ = 2⁵ + 5 (2)⁴(-2b) + 10(2)³(-2b)² + 10(2)²(-2b)³ + 5(2)(-2)⁴ + (- 2b)⁵
a. 10 - 5 = 5
b. 10 + 5 = 15