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andersonlucas28
@andersonlucas28
October 2020
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Quanto é (6+r)(3-r)
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emicosonia
Quanto é (6+r)(3-r)
(6+r)(3-r) fazer a distributiva
18 - 6r + 3r - r²
18 - 3r - r² ------------------igualar a ZERO
18 - 3r - r² = 0 arrumar a casa
-r² - 3r + 18 = 0 achar as raízes
a = - 1
b = - 3
c = 18
Δ = b² - 4ac
Δ = (-3)² - 4(-1)(18)
Δ = + 9 + 72
Δ = 81--------------------------------√81 = 9
se
Δ > 0
então
baskara
r = - b - +
√Δ/2a
r' = -(-3) - √81/2(-1)
r' = + 3 - 9/-2
r' = - 6/-2
r' = + 6/2
r' = + 3
e
r" = -(-3) + √81/2(-1)
r" = + 3 + 9/-2
r" = 12/-2
r" = -12/2
r" = - 6
V = { 3; - 6}
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Lista de comentários
(6+r)(3-r) fazer a distributiva
18 - 6r + 3r - r²
18 - 3r - r² ------------------igualar a ZERO
18 - 3r - r² = 0 arrumar a casa
-r² - 3r + 18 = 0 achar as raízes
a = - 1
b = - 3
c = 18
Δ = b² - 4ac
Δ = (-3)² - 4(-1)(18)
Δ = + 9 + 72
Δ = 81--------------------------------√81 = 9
se
Δ > 0
então
baskara
r = - b - + √Δ/2a
r' = -(-3) - √81/2(-1)
r' = + 3 - 9/-2
r' = - 6/-2
r' = + 6/2
r' = + 3
e
r" = -(-3) + √81/2(-1)
r" = + 3 + 9/-2
r" = 12/-2
r" = -12/2
r" = - 6
V = { 3; - 6}