Respostas
respondido por:
1
100x² - 50x - 25 = 0 (:25)
4x² - 2x - 1 = 0
a = 4; b = - 2; c = - 1
Δ = b² - 4ac
Δ = (-2)² - 4.4.(-1)
Δ = 4 - 16.(-1)
Δ = 4 + 16
Δ = 20
√Δ = √20
√Δ = √4.√5
√Δ = 2√5
x = - b +/- √Δ = - (-2) +/- √20
--------------- --------------------
2a 2.4
x = 2 + 2√5 = 2 + 2√5 = 1 + √5 1 + √5
------------ ----- -------- --- ----- = --------------
8 8 8 4 4 4
x = 2 - 2√5 = 1 - √5
------------ ----------
8 4
4x² - 2x - 1 = 0
a = 4; b = - 2; c = - 1
Δ = b² - 4ac
Δ = (-2)² - 4.4.(-1)
Δ = 4 - 16.(-1)
Δ = 4 + 16
Δ = 20
√Δ = √20
√Δ = √4.√5
√Δ = 2√5
x = - b +/- √Δ = - (-2) +/- √20
--------------- --------------------
2a 2.4
x = 2 + 2√5 = 2 + 2√5 = 1 + √5 1 + √5
------------ ----- -------- --- ----- = --------------
8 8 8 4 4 4
x = 2 - 2√5 = 1 - √5
------------ ----------
8 4
pedru23:
Termo C= -25
respondido por:
1
100X² - 50X - 25 = 0
A = 100 B= -50 C= -25 Δ=B²-4AC Δ = (-50)² - 4 . 100 . (-25)
Δ= 2500 +10000 Δ=12500
-B +- √Δ - (-50) +- √Δ
X = ------------------- X = ---------------------
2A 2 . 100
50 +- √12500
X= ----------------------- 50 +- 111,80
200 X= ---------------------
200
X' = (50 + 111,80) / 200 = 0,809
X'' = (50 - 111,80) / 200 = -61,80 / 200 = - 0,309
A = 100 B= -50 C= -25 Δ=B²-4AC Δ = (-50)² - 4 . 100 . (-25)
Δ= 2500 +10000 Δ=12500
-B +- √Δ - (-50) +- √Δ
X = ------------------- X = ---------------------
2A 2 . 100
50 +- √12500
X= ----------------------- 50 +- 111,80
200 X= ---------------------
200
X' = (50 + 111,80) / 200 = 0,809
X'' = (50 - 111,80) / 200 = -61,80 / 200 = - 0,309
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