Answer
a.-3^-1
b.-0.4
c.The approximation error is = 0.0667
Work Step by Step
x.=0.5,dx=0.1
x.+dx=0.5+0.1
=0.6
a.use in given formula
=f(x.+dx)-f(x.)
=0.6^-1 - 0.5^-1
=-3^-1
b.df/dx=?
df/dx=-x^-2
=-(0.5)^-2*dx
=-4*0.1
=-0.4
c. the approximation error=?
=I-3^-1 -(-0.4)I
=I-3^-1 + 0.4I
=0.06666666667
=0.0667