أنشئ حسابًا أو سجّل الدخول للانضمام إلى مجتمعك المهني.
Take a few examples. Say25*35 or35*75 or45*95.
Take75*25, for example. Add the numbers and divide by2. We get50, square it, we get2500.
Take the difference of two numbers and divide by2. We get25, square it, we get625.
2500-625=1875 is the answer.
(a+b)*(a-b)=a^2-b^2
In the above example a=50, b=25
so,75*25=50^2-25^2
