Question

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

Answer 1

Given $f\left(x\right)=x^2$
$f\left(1.1\right)=1.21$
$f\left(1\right)=1$
$\frac{f\left(1.1\right)-f\left(1\right)}{\left(1.1\right)-1}=\frac{1.21-1}{1.1-1}$
$=\frac{0.21}{0.1}$
$=2.1$