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BRENDHACAROLINE
@BRENDHACAROLINE
October 2020
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o triplo do quadro de um número x , menos o dobro desse número , é igual á quinta parte de x.
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3478elc
Verified answer
3x^2 - 2x = x/5
3x^2 - 2x - x/5 = 0
Δ = (-2)^2 - 4.3.(-1/5)
Δ = 4 - 12.(-1/5)
Δ = 4 + 12/5
Δ = 20+12/5
Δ = 32/5
x' = [-(-2) + √32/5]/2.3 = [2 + √32/5]/6 = [2 + 4√2/5]/6
x' = [-(-2) - √32/5]/2.3 = [2 - √32/5]/6 = [2 - 4√2/5]/6
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Verified answer
3x^2 - 2x = x/53x^2 - 2x - x/5 = 0
Δ = (-2)^2 - 4.3.(-1/5)
Δ = 4 - 12.(-1/5)
Δ = 4 + 12/5
Δ = 20+12/5
Δ = 32/5
x' = [-(-2) + √32/5]/2.3 = [2 + √32/5]/6 = [2 + 4√2/5]/6
x' = [-(-2) - √32/5]/2.3 = [2 - √32/5]/6 = [2 - 4√2/5]/6