Question

determine as raizes das funçoes quadraticas :

A ) f(x) = x* - 7x + 14 =

B ) f (x) = x* = 5 + 4

C ) f (x) = x* - 8x + 15


ME AJUDA AI GALERA


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Answer 1

Resposta:

Explicação passo-a-passo:

a) y = x² - x - 12

y = 0

x² - x -12 = 0

x = (1+/- √1 + 48)/2

x = (1 +/- √49) / 2

x1 = (1 + 7)÷2 = 8 ÷ 2 = 4

x2 = (1 - 7) ÷ 2 = -6 ÷ 2 = -3

b) f(x) = 6x² + x -1

f(x) = 0

6x² + x - 1 = 0

x = (-1 +/- √1 + 24) ÷ 12

x = (-1 +/- √25) ÷ 2

x1 = (-1 + 5) ÷ 2 = 4 ÷ 2 = 2

x2 = (-1 - 5) ÷ 2 = -6 ÷ 2 = -3

c) f(x) = x² - 2x - 24

f(x) = 0

x² - 2x - 24 = 0

x = (2 +/- √4 + 96) ÷ 2

x = (2 +/- √100) ÷ 2

x1 = (2 + 10) ÷ 2 = 6

x2 = (2 - 10) ÷ 2 = -4