Question

13+x 13-xneed the formula test on....​

Answer 1

$\textit{(a+b)(a-b)= }$

$(a)^2$- $(b)^2$

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$\textit{❥︎solution of this,}$

$\textit{➠</p><p>(13+x)(13-x)}$= $(13)^2$-$(x)^2$= $\textit{169-x2}$