Question

2x²+x-21=0 equação de 2 grau

Answer 1

2x²+x-21=0
Δ=1²-4x2x(-21)
Δ=1+168
Δ=169
x₁=-1+√169/2x2
x₁=-1+13/4
x₁=12/4
x₁=3
x₂=-1-√169/2x2
x₂=-1-13/4
x₂=-14/4
x₂=-7/2
x₂=-3,5

Answer 2

Ola Wesle

2x² + x - 21 = 0

delta
d² = 1 + 168 = 169
d = 13

x1 = (-1 + 13)/4 = 12/4 = 3
x2 = (-1 - 13)/4 = -14/4 = -7/2

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