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Gabii1404
@Gabii1404
December 2019
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– 2x + x2 = 15 (CONTA PFV)
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lelunardi1
– 2x + x² = 15 colocar em ordem
x² -2x -15 = 0 equação do 2o. grau = Báskara
Δ = b² - 4.a.c
Δ = -2² -4.1.-15
Δ = 4 + 60
Δ = 64
x = -b +-
√Δ / 2.1
x = -(-2) +-
√64 /2
x = 2 +- 8/2 x' = 1 + 8/2 x'' = 1 - 8/2
x' = 9/2 x'' = -7/2
x' = 4,5 x'' = -3,5
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Lista de comentários
x² -2x -15 = 0 equação do 2o. grau = Báskara
Δ = b² - 4.a.c
Δ = -2² -4.1.-15
Δ = 4 + 60
Δ = 64
x = -b +- √Δ / 2.1
x = -(-2) +- √64 /2
x = 2 +- 8/2 x' = 1 + 8/2 x'' = 1 - 8/2
x' = 9/2 x'' = -7/2
x' = 4,5 x'' = -3,5