Question

5) Encontre o zero das seguintes funções afim
a) f(x) = 2x
b) f(x) = 4x + 4
c)f(x)= 2x/2
d) f(x) = -3x + 1
e) f(x) = -4x

Answer 1

Resposta:

a)

\begin{gathered}y= 2x-3\\0 = 2x-3\\2x-3 = 0\\2x = 3\\x= \frac{3}{2} \\x = 1,5\end{gathered}

y=2x−3

0=2x−3

2x−3=0

2x=3

x=

2

3

x=1,5

b)

\begin{gathered}f(x) = 9x+\sqrt{3} \\0 = 9x + \sqrt{3} \\9x + \sqrt{3} = 0\\9x + 1,7 = 0\\9x = -1,7\\x = -1,7/9\\\end{gathered}

f(x)=9x+

3

0=9x+

3

9x+

3

=0

9x+1,7=0

9x=−1,7

x=−1,7/9

c)

\begin{gathered}g(x) = 7x^{4} \\0 = 7x^{4} \\7x^{4}= 0\\x^{4} = 7\\x = \sqrt[4]{7}\end{gathered}

g(x)=7x

4

0=7x

4

7x

4

=0

x

4

=7

x=

4

7