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(2x-3)(x+7) = 0
x = 3/2 , x= -7 , karena x1 < x2
x1 = -7 x2=3/2
2 kali x2 + x1 = . . . . . . .
2(3/2 - 7 ) = 2.-11/2 = -11
2x^ 2 + 11x – 21= 0
jawab.
2x^ 2 + 11x – 21= 0 faktorkan menjadi
(x + 7) (2x - 3) = 0
nilai x
x = - 7 dan x = 3/2
x1 < x2 maka nilainya
x1 = - 7 dan x2 = 3/2
maka nilai dari 2 kali x2 + x1 = 2 (-7 + 3/2) = - 11
Semoga membantu :) D jadikan jwb terbaik ya