2. Polynomials
easy

घनाभों (cuboids), जिनके आयतन नीचे दिए गए हैं कि, विमाओं के लिए संभव व्यंजक क्या हैं ?

आयतन : $3 x^{2}-12 x$

Option A
Option B
Option C
Option D

Solution

Volume of a cuboid $=($ Length $) \times($ Breadth $) \times($ Height $)$

Volume $=3 x^{2}-12 x$

On factorising $3 x ^{2}-12 x ,$ we have

$3 x ^{2}-12 x =3\left[ x ^{2}-4 x \right]=3 \times[ x ( x -4)]=3 \times x \times( x -4)$

$\therefore$ The possible dimensions of the cuboid are: $3, x$ and $(x-4)$ units.

Standard 9
Mathematics

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