Question

${ \times} ^{2} + \times - 12 = 0$
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Answer 1

Solução :

X² + X - 12 = 0

Δ=b²-4ac

Δ=1²-4 . 1  . (-12)

Δ=1+48

Δ=49

x= -1±√49/2.1

x= -1±7/2

x₁= -1+7/2 = 3

x₂= -1-7=2 = -4

Resp : x₁= 3 e x₂ = -4