Question

Persamaan kuadrat 2x² - 3x - 4 = 0 mempunyai akar-akar X1 dan X2. Tentukan nilai X1 + 2X2!

Answer 1

Diketahui: a = 2, b = -3, c = -4

Maka:

X1 = -b/a

X1 = - (-3)/2

X1 = 3/2

dan,

X2 = c/a

X2 = -4/2

X2 = -2

Nilai X1 + 2X2

= 3/2 + 2(-2)

= 3/2 - 4

= 3/2 - 8/2

= -5/2

= -2½

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