Question

seja função f: R = R (imagem)​

Answer 1

Resposta:

2. a) f(0) = 0² - 9 = - 9

b) f(3) = 3² - 9 = 0

c) f(-5) = (-5)²-9 = 25 - 9 = 16

d) x² - 9 = 0 <=> x² = 9 <=> x=3 V x= - 3

e) x²-9 = 7 <=> x² = 16 <=> x = 4 V x = - 4

3. a) 2(3)-5 = 6-5 = 1

b) 2(-5) - 5 = - 10 - 5= - 15

c) 2x -5 = 0 <=> 2x = 5 <=> x=5/2

d) 2x - 5 = - 5 <=>2x = 0 <=> x=0

4.a) 3(2) +7 = 6 +7 = 13

b) 3 (-7/3) +7 = - 7 +7 = 0

c) 3 (3/2) +7 = 6/2 + 7 = 3 + 7 = 10