Question

8º) Encontre a raiz das funções abaixo:
a) f(x)=8x+5
b) f(x)=2x-10
c) y=x²100
d) y=x²-64

Answer 1

a) 8x + 5 = 0
      8x = - 5
       x  = -5/8
b) 2x - 10 = 0
   2x= 10
     x = 5
c) x² - 100 = 0
    x² = 100
    x = √100 
   x = 10 ou x =-10
d)x² - 64 = 0
  x² = 64
  x = √64
 x = 8 ou x= -8

Answer 2

a) f(x) = 0 => 8.x + 5 = 0 => 8.x = -5 => x = -5/8
b) f(x)  = 0 => 2.x - 10 = 0 => 2.x = 10 => x = 10/2 => x = 5
c) f(x) = 0 => x² - 100 = 0 => x² = 100 => x = √100 => x = 10
d) f(x) = 0 => x² - 64 = 0 => x² = 64 => x = √64 => x = 8