Using the identity for difference of two squares, find the value of :

${\left(86\right)}^2-{\left(76\right)}^2$

Using the identity for difference of two squares, find the value of :

${\left(203\right)}^2-{\left(197\right)}^2$

Using the identity for difference of two squares, find the value of :

${\left(121\right)}^2-{\left(119\right)}^2$

Using the identity for difference of two squares, find the value of :

${\left(169\right)}^2-{\left(131\right)}^2$

Find the value of $\mathrm{x}$, if: $13x={\left(58\right)}^2-{\left(45\right)}^2$

If $24x={\left(99\right)}^2-{\left(87\right)}^2$, then $x$ is

Simplify:

$\frac{297\times 297-203\times 203}{94}$

Simplify:

$\frac{23.71\times 23.71-16.29\times 16.29}{0.742}$

The value of $\frac{1.49\times 1.49-0.51\times 0.51}{1.49+0.51}$ equals