Question

f(x)=4x³+x-1 determine=

 

a) f(-1/2)=              b) f (-1)=

Answer 1

a) f(-1/2)=4(-1/2)³+(-1/2)-1 =
                4(-1/8)-1/2-1 = -1/2-1/2-1 = -2            


b) f (-1)=4(-1)³+(-1)-1=
              -4 -1-1 = -6

Answer 2

f(x)=4x³+x-1 determine:
 a) f(-1/2)
f(-1/2)= 4(-1/2)³-1/2-1
f(-1/2)= 4(-1/8)-1/21
f(-1/2)= -4/8-1/2-1
f(-1/2)= -1/2-1/2-1
f(-1/2)= -1-1-2/2
f(-1/2) = -4/2 = -2

 b) f (-1)
f(-1)= 4(-1)³-1-1
f(-1)= 4(-1)-1-1
f(-1)=-4-1-1
f(-1)= -6