Question

Equação do 2 grau
2Xelevada a 2 -6x-20=0
X elevado a 2+x-20=0

Answer 1

Olá, Polyanegatinh1!

2x² - 6x - 20 = 0
a = 2
b = -6
c = -20

Δ = b² - 4.a.c
Δ = (-6)² - 4.2.(-20)
Δ = 36 + 160
Δ = 196

-b +- √Δ / 2.a
-(-6) +- √196 / 2.2
6 +- 14 / 4

x' = 6+14/4 = 20/4 = 5
x'' = 6-14/4 = -8/4 = -2
S = {5, -2}

x² + x - 20 = 0
a = 1
b = 1
c = -20

Δ = b² - 4.a.c
Δ = 1² - 4.1.(-20)
Δ = 1 + 80
Δ = 81

-b +- √Δ / 2.a
-1 +- √81 / 2.1
-1 +- 9 / 2

x' = -1+9/2 = 8/2 = 4
x'' = -1-9/2 = -10/2 = -5
S = {4, -5}

Answer 2

2x^2-6x-20=0
delta=b^2-4.a.c
delta= (-6)^2-4.2.(-20)
delta=36+160
delta=196
x=-b-/+ raiz de delta/2a
x=-(-6)-14/2.2
x=6-14/4
x=-8/4
x=-2
x=-(-6)+14/2.2
x=6+14/4
x=20/4
x=5
x^2+x-20=0
delta=b^2-4.a.c
delta=1^1-4.1.(-20)
delta=1+80
delta=81
x=-b-/+ raiz de delta/2a
x=-1-9/2.1
x=-10/2
x=5
x=-1+9/2.1
x=8/2
x=4