8th Class Mathematics Sample Paper Mathematics Sample Paper - 5

  • question_answer
    Factorise: \[49{{x}^{2}}-36{{y}^{2}}\]

    Answer:

    \[49{{x}^{2}}36{{y}^{2}}={{\left( 7x \right)}^{2}}{{\left( 6y \right)}^{2}}\]         
    \[=\left( 7x+6y \right)\left( 7x6y \right)\]
    [using \[{{a}^{2}}{{b}^{2}}\text{ }=\left( a+b \right)\text{ }\left( ab \right)]\] ½


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