Question

If $f(x) = x^2$, find $\frac {f(1.1)-f(1)}{(1.1-1)}$

Answer 1

$f(x)=x^2$

∴ $\frac {f(1.1)-f(1)}{(1.1-1)}$

= $\frac {f(1.1)^2-f(1)^2}{(1.1-1)}$

= $\frac {1.21-1}{0.1}$

= $\frac {0.21}{0.1}$

= $2.1$