Question

resolva identifique os coeficientes e determine as raizes se existir a) x²-5x+6=0 b) x²-8x+12=0 c) x²+2x-8=0 d) x²-5x+8=0 e) 2x²-8x+8=0 f) -x²-4x-5=0 me ajudem porfavor

Answer 1

a) a = 1 , B = -5 e C = 6

x² - 5x + 6 =0

x = (5 ± √5² - 4.1.6)/2

x = (5 ± √ 1)/2

x = (5 ± 1)/2

x' = 3

x" = 2

b) A =1 , B = -8 e C = 12

x² - 8x + 12 = 0

x = (8 ± √8² - 4.1.12)/2

x = (8 ± 4 )/2

x' = 2

x" = 6

c) A = 1 , B = 2 e c = -8

x² + 2x - 8 = 0

x = (-2 ± √ 2² - 4.1.(-8))/2

x = (- 2 ± 6 )/2

x' = -4

x" = 2

d) A =1 , B = -5 e C = 8

x² - 5x + 8 = 0

x = (5 ± √5²- 4.1.8)/2

x = (5 ± √ -7)/2

S = Ø

e) A= 2 , B = -8 e C = 8

2x² - 8x + 8 = 0

x = (8 ± √8² - 4.2.8)/2.2

x = (8 ± 0)/4

x' e x" = 2

e) A = -1 , B = -4 e C = - 5

- x² - 4x - 5 = 0

x = (4 ± √4² - 4.(-1).(-5))/-2

x = (4 ± √-4)/-2

S = ∅