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(2x -1 ) ( x - 5)
x = 1/2 atau x = 5
diketahui
x₁ < x₂
maka
x₁ = 1/2
x₂ = 5
nilai dari 2x₁ + 4x₂
2(1/2) + 4(5)
= 1 + 20
= 21