Question

Considere a função do primeiro grau f (x) = -3X + 2 .Determine os valores de x para que se tenha: a) f(x )= 0 b) f( x) =11 c) f( x )= - 1/2

Answer 1

A) F(x)=-3x+2
0=-3x+2
-2=-3x
x=2/3

B)11=-3x+2
11-2=-3x
9=-3x
x=-3


c) -1/2=-3x+2

-1/2-2=-3x

(tira MMC de 2 e 1)

-1/2-4=-3x

-1-4=-6x
-5=-6x

x=5/6

Answer 2

$f(x) = -3x+2=0 \\ f(x)=-3x=-2 \\ f(x)=x= \frac{-2}{-3} \\ x= \frac{2}{3}$

$f(x)=-3x+2=11 \\ x= \frac{9}{-3} \\ x=-3$

$f(x)=-3x+2 \\f(x)=-3 x= \frac{-1}{2}-2 \\ -3x= \frac{-3}{2} \\ x=\frac{-3}{2}/-3 \\ x=\frac{-3}{2}. \frac{1}{-3} \\ x= \frac{-3}{-6} \\ x= \frac{3}{6} \\ x= \frac{1}{2}$