8th Class Mathematics Sample Paper Mathematics Sample Paper - 3

  • question_answer Factorise : \[9{{x}^{2}}-1\]

    Answer:

    \[9{{x}^{2}}-1\text{ }={{\left( 3x \right)}^{2}}-{{\left( 1 \right)}^{2~}}\] \[=\left( 3x+1 \right)\left( 3x-1 \right)~\]


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