Question

dada a função afim f(x)=2x+3, determine os valores de x para que:
a)f(x)=1
b)f(x)=0
c)f(x)=-3
d)f(x)=1/3

Answer 1

a) $2x+3=1\\2x=1-3\\2x=-2\\x=\frac{-2}{2}\\x=-1$

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

c) $2x+3=-3\\2x=-3-3\\2x=-6\\x=\frac{-6}{2} \\x=-3$

d) $2x+3=\frac{1}{3} \\2x=\frac{1}{3} -3\\2x=\frac{1-9}{3}\\ 2x=\frac{-8}{3} \\x=\frac{-8}{6} \\x=-\frac{4}{3}$