Question

podem me ajudar a resolver a 2) , 3) ,4) , 5) e 6)

Answer 1

Ola Laura

2)

3x - y = -1
x + 2y = 9
6x - 2y = -2

7x = 7
x = 1

3 - y = -1
y = 4

4) 

f(x) = 2x - 3

f(1) = -1
f(2) = 1
f(1/2) = -2

3f(1) + 5f(2) - f(1/2) = -3 + 5 + 2 = 4

5)

x² - 8x - 7 = -14

x² - 8x + 7 = 0

delta
d² = 64 - 28 = 36
d = 6

x1 = (8 + 6)/2 = 14/2 = 7
x2 = (8 - 6)/2 = 2/2 = 1

6)

f(x) = x² - 3px + 7

f(-6) = 36 + 18p + 7 = -18

18p = -18 - 36 - 7

18p = -61

p = -61/18

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