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2x - 5x = 8 + 1
-3x = 9
x= 9/-3= -3
maka nilai dari 2x²-4 = 2(-3²)-4 = 18-4 = 14
2x - 5x = 8 + 1
-3x = 9
3x = -9
x = -9/3
x = -3
2x² - 4 = 2(-3)² - 4
= 2(9) - 4
= 18 - 4
= 14