Eqiacao de 2 grau 8x-8x-2=0
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2
8x² - 8x - 2 = 0 (:2)
4x² - 4x - 1 = 0
a = 4; b = - 4; c = - 1
Δ = b² - 4ac
Δ = (-4)² - 4.4.(-1)
Δ = 16 + 16
Δ = 32
√Δ = √32 = √16.√2 = 4√2
a = 4; b = - 4; c = - 1
x = - b +/- √Δ = - ( - 4) + /- √32
--------------- ----------------------
2a 2.4
x = 4 +/- 4√2 = 4 +/- 4√2
------------- ------ ---------
8 8 8
x = 1 +/- √2 1 +/- √2
--- ------ = -------------
2 2 2
x' = 1 + √2
-----------
2
x" = 1 - √2
----------
2
4x² - 4x - 1 = 0
a = 4; b = - 4; c = - 1
Δ = b² - 4ac
Δ = (-4)² - 4.4.(-1)
Δ = 16 + 16
Δ = 32
√Δ = √32 = √16.√2 = 4√2
a = 4; b = - 4; c = - 1
x = - b +/- √Δ = - ( - 4) + /- √32
--------------- ----------------------
2a 2.4
x = 4 +/- 4√2 = 4 +/- 4√2
------------- ------ ---------
8 8 8
x = 1 +/- √2 1 +/- √2
--- ------ = -------------
2 2 2
x' = 1 + √2
-----------
2
x" = 1 - √2
----------
2
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