We have to factorise \(\begin{array}{l}a^{2}-2ab-b^{2}\end{array} \) Solution \(\begin{array}{l}a^{2}-2ab-b^{2}\end{array} \) =\(\begin{array}{l}a^{2}-ab-ab-b^{2}\end{array} \) =\(\begin{array}{l}a(a-b)-b(a-b)\end{array} \) =\(\begin{array}{l}(a-b)(a-b)\end{array} \) =\(\begin{array}{l}(a-b)^{2}\end{array} \)
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