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![\bf \textit{difference of squares} \\\\ (a-b)(a+b) = a^2-b^2 \\\\[-0.35em] ~\dotfill\\\\ a^2-b^2=15\implies (a-b)(a+b)=15\implies \stackrel{\stackrel{a-b}{\downarrow }}{(7)}(a+b)=15\implies a+b=\cfrac{15}{7}](/tpl/images/0461/3107/d4dd8.png)
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If a^2-b^2=15 and (a-b)=7 what is the value of(a+b)...
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