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Exercise

$\left(7+x\right)\left(7-x\right)$

Step-by-step Solution

1

Apply the formula: $\left(a+b\right)\left(a+c\right)$$=a^2-b^2$, where $a=7$, $b=x$, $c=-x$, $a+c=7-x$ and $a+b=7+x$

$49-x^2$

Final answer to the exercise

$49-x^2$

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