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Verified answer
X² + 2x - 3 = 0a = 1
b = 2
c = -3
Dengan pemfaktoran
(x + 3)(x - 1) = 0
x₂ = -3 x₁ = 1
Dengan rumus ABC
x₁ , x₂ = (-b +- √b²-4ac ) / 2a
= (-2 +- √2²-4(1)(-3) ) / 2(1)
= ( - 2 +- √16 ) / 2
= ( -1 +- 2)
x₁ = -1 + 2
= 1
x₂ = -1 - 2
= -3