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

${\left(84\right)}^2-{\left(76\right)}^2$

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

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

Find the value of $x$ if

$13x={58}^2-{45}^2$

Find the value of $x$ if

$24x={99}^2-{87}^2$

Simplify:

 $179\times 179-21\times 21$

simplify:

$1.62\times 1.62-0.38\times 0.38$

Simplify:

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

Simplify:

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