Question 1076094
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<pre>
{{{(a-b)^2)}}} = 289 = {{{a^2 - 2ab + b^2}}},     (1)

{{{(a+b)^2)}}} = 169 = {{{a^2 + 2ab + b^2}}}.     (2)


Now subtract (1) from (2. You will get

4ab = 169-289 = -120.


Hence, |4ab| = 120.
</pre>

<U>Answer</U>. |4ab| = 120.


Solved.