Question

Qual a raiz da função y = 5x + 30 *

a) 6

b) _6

c) 12

d) _12

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Answer 1

Resposta:

Y= 5x - 30

5x = -30

x = -30/5

x = -6

Answer 2

-6, -5, 0, 1, 5 e 6

x² - x - 30 = 0

f(-6) = (-6)² -(-6) - 30 = 36 + 6 - 30 = 12 ---- ≠ 0

f(-5) = (-5)² -(-5) - 30 = 25 + 5 - 30 = 0 (Raiz x')

f(0) = 0² - 0 - 30 = -30 --------≠ 0

f(1) = 1² - 1 - 30 = -30 ---------≠ 0

f(5) = 5² -5 - 30 = 25 - 5 - 30 = -10 -------≠ 0

f(6) = 6² - 6 - 30 = 36 - 6 - 30 = 0 (Raiz x")