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Alexsandrakarin
@Alexsandrakarin
January 2020
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Calcule a raiz da equação : x elevado a 2 -3x-4=0 para isto use as formulas :
/\ = B elevado a 2 -4.a.c
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PauloBarros
Verified answer
X² - 3x - 4 = 0
a = 1; b = - 3; c = - 4
Δ = b² - 4ac
Δ = (-3)² - 4.1.(-4)
Δ = 9 + 16
Δ = 25
x = - b +/- √Δ - (-3) +/- √25
--------------- = ------------------
2a 2.1
x = 3 + 5
-------- = 8/2
= 4
2
x = 3 - 5
-------- = - 2/2
= - 1
2
R.:
x = 4 e x = - 1
******************************
0 votes
Thanks 0
Teffah
X²-3x-4=0
/\=(-3)²-4.1.(-4)
/\=9+16
/\=25
x=-b+-raiz25
--------------
2.a
x=-(-3)+-5
-----------
2
x=3+-5
-------
2
x'=3+5 8
-------- = --- = 4
2 2
x"=3-5 -2
------ = ---- = -1
2 2
Verificação:
x=4
x²-3x-4=0
4²-3.4-4=0
16-12-4=0
16-16=0 (V)
x=-1
x²-3x-4=0
(-1)²-3.(-1)-4=0
1+3-4=0
4-4=0 (V)
1 votes
Thanks 1
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Verified answer
X² - 3x - 4 = 0a = 1; b = - 3; c = - 4
Δ = b² - 4ac
Δ = (-3)² - 4.1.(-4)
Δ = 9 + 16
Δ = 25
x = - b +/- √Δ - (-3) +/- √25
--------------- = ------------------
2a 2.1
x = 3 + 5
-------- = 8/2 = 4
2
x = 3 - 5
-------- = - 2/2 = - 1
2
R.: x = 4 e x = - 1
******************************
/\=(-3)²-4.1.(-4)
/\=9+16
/\=25
x=-b+-raiz25
--------------
2.a
x=-(-3)+-5
-----------
2
x=3+-5
-------
2
x'=3+5 8
-------- = --- = 4
2 2
x"=3-5 -2
------ = ---- = -1
2 2
Verificação:
x=4
x²-3x-4=0
4²-3.4-4=0
16-12-4=0
16-16=0 (V)
x=-1
x²-3x-4=0
(-1)²-3.(-1)-4=0
1+3-4=0
4-4=0 (V)