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1/2 x² + 2x |ᵃ₀ = 16
1/2 (a² - 0²) + 2(a - 0) = 16
1/2 a² + 2a = 16 .....(kalikan 2)
a² + 4a = 32
a² + 4a - 32 = 0
(a + 8)(a - 4) = 0
a = - 8 atau a = 4
a batas atas , 0 batas bawag --> a > 0
a = 4