Question

Considere a função do 1ºgrau F(x): -42x+2. Determine os valores de x para que se tenha

a) F (x):0

b) F (x):21

c) F (x):-2

d) F (x):-14

e) F(x):12

Answer 1

 
 
 
 
 
 

Considere a função do 1ºgrau F(x): -42x+2. Determine os valores de x para que se tenha 

a) F (x):0 ==> -42x+2=0==> -42x = -2 ==> x = 2/42

b) F (x):21==> -42x+2=21==> -42x = -2+21  ==> -42x = 19 ==> x = - 19/42

c) F (x):-2==> -42x+2=-2==> -42x = -2-2  ==> x = 4/42

d) F (x):-14==> -42x+2=-14==> -42x = -2-14  ==> x = -16/42

e) F(x):12==> -42x+2=12==>-42x = -2+12 ==> x = -10/42

Answer 2

f(x) = -42x + 2
a) f(x) = 0 ==>> -42x + 2 = 0 => x = -2/-42 => x = 1/21
b) f(x) = 21 =>> -42x + 2 = 21 => -42x = 21 - 2 => x = -19/42
c) f(x) = -2 ==>> -42x + 2 = -2 => -42x = -4 => x = 2/21
d) f(x) = -14==> -42x + 2 = -14 => -42x = -16 => x = 8/21
e) f(x) = 12 ==> -42x + 2 = 12 => -42x = 10 => x = -5/21