Question

a) X² - 49= 0

b) x² + 2x - 24=0
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Answer 1

Resposta:

Olá bom dia!

a)

x² - 49 = 0

x² = 49

x = ± √49

x = ± 7

S = {-7;+7}

b)

x² + 2x - 24=0

a = 1 ; b = 2 ; c = -24

∆ = b² - 4ac

∆ = 2² - 4(1)(-24)

∆ = 4 + 96 = 100

√∆ = √100 = ± 10

x = (-b ± √∆) / 2a

x = (-2 ± 10)/2*1

x' = 8/2

x' = 4

x'' = -12/2

x" = -6

S = {-6;4}