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সূত্রের সাহায্যে বর্গ নির্ণয় কর: $ax-by-cz$

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সূত্রের সাহায্যে বর্গ নির্ণয় করা হলো :

$ax-by-cz$ এর বর্গ

$=(ax-by-cz)^2$

$=\left\lbrace\left(ax-by\right)-cz)\right\rbrace^2$

$=\left(ax-by\right)^2$$-2\cdot\left(ax-by\right)\cdot cz$$+\left(cz\right)^2$

$=\left\lbrace\left(ax\right)^2-2\cdot ax\cdot by+\left(by\right)^2\right\rbrace$$-2cz\left(ax-by\right)$$+\left(cz\right)^2$

$=a^2x^2-2abxy+b^2y^2$$-2acxz+2bcyz+c^2z^2$

$=a^2x^2+b^2y^2+c^2z^2$$-2abxy+2bcyz-2acxz$ [Answer]

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