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Exercise

$\left(k+r\right)\left(k-r\right)$

Step-by-step Solution

1

Apply the formula: $\left(a+b\right)\left(a+c\right)$$=a^2-b^2$, where $a=k$, $b=r$, $c=-r$, $a+c=k-r$ and $a+b=k+r$

$k^2-r^2$

Final answer to the exercise

$k^2-r^2$

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