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Verified answer
X^2-5x+4 = 0(x-1)(x-5) = 0
x-1 = 0
x = 1
x-5 = 0
x = 5
Karena x1 > x2, maka x1 = 5, x2 = 1
2x1+5x1 = 2(5)+5(1) = 10+5 = 15