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a = 1
b = 4
c = 3
(x₁ + x₂) - x₁ • x₂
= (-b/a) - c/a
= (-4/1) - 3/1
= -4 - 3
= -7
Jadi, nilai dari (x₁ + x₂) - x₁ • x₂ = -7
Jawab:
maka
(x1 + x2) -x1 . x2 = ...
(-1+(-3)) - (-1.-3)
= -4 - 3
= -7