Gunakan substitusi y=2x^2+x-5 y=-4x-2

y = 2x² + x - 5
y = -4x - 2

y = y
2x² + x - 5 = -4x - 2
2x² + 5x - 3 = 0
(2x + 6) (2x - 1) = 0

x = -3
x = 1/2

x = -3
y = 2(-3)² + (-3) - 5
y = 18 - 3 - 5
y = 10

x = 1/2
y = -4 (1/2) - 2
y = -2 - 2
y = -4

Matematika Peminatan
SPLKDV X SMA

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