class-eight _math

x+y=12 এবং xy= 27 হলে, (x-y)\displaystyle ^{2} ও x\displaystyle ^{2}+y\displaystyle ^{2}এর মান নির্নয় কর ।

দেওয়া আছে ,
x+y=12 এবং xy= 27

এখন ,
(x-y)\displaystyle ^{2} =(x+y)\displaystyle ^{2}-4xy
=(12)\displaystyle ^{2}-4.27
=144-108
=36 (ans):

class-eight_ math _img

আবার,,
x\displaystyle ^{2}+y\displaystyle ^{2}
\displaystyle  \begin{array}{{>{\displaystyle}l}} =( x+y)^{2} -2xy \end{array}
=(12)\displaystyle ^{2} – 2.27
=144-54
=90 (ans):

Post Author: showrob

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