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p - q = √D/a
p - q = √(b² - 4ac) / a
p - q = √(1² - 4 • 2 • -3) / 2
p - q = √(1 + 24) / 2
p - q = 5/4
p² - q² = (p + q) (p - q)
p² - q² = (-½) (5/2)
p² - q² = -5/4
Jadi, nilai dari p² - q² adalah -5/4
Ok?