Question

x2-3x-4-0 resolva essa equaçao do 2 grau

Answer 1

$x^{2} - 3x - 4 = 0$
Δ = $(-3)^{2} - 4 . 1 . 4$
Δ = $9 + 16$
Δ = $25$

$x = \frac{-(-3) +- \sqrt{25} }{2.1}$
$x = \frac{3 +- 5}{2}$

$x' = \frac{3+5}{2} = \frac{8}{2} = 4$
$x''= \frac{3 - 5}{2} = \frac{-2}{2} = -1$

Answer 2

♡Valores de a, b, c♡
a= 1
b= -3
c= -4

♡Calculando o valor de Delta♡
= b*2-4ac
= (-3)*2 -4×1× (-4)
=9+16
=25

♡Colocando na formula♡
x= -b +/- \/
--------------------
2a

x= -(-3) +/- \/25
-----------------------
2×1

x=3 +/- 5
--------------
2

x'= 3+5
------------
2

x'= 8/2 x'=4

x''= 5-3
------------
2

x''= 2/2 x'=1