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X=-9is root of matrx |x,3,7|

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X=-9is root of matrx |x,3,7|

    • Posted by Ashish Pandey 4 years, 3 months ago

    CBSE > Class 12 > Mathematics
    • 1 answers

    Yogita Ingle 4 years, 3 months ago

    Expanding along R1 
    x(x2−12)−3(2x−14)+7(12−7x)=0
    ⇒x3−12x−6x+42+84−49x=0  
    ⇒x3−67x+126=0  ………………i
    Here 126×1=9×2×7126×1=9×2×7
    For x=2, 23−67×2+126=134−134=0 
    Hence x=2 is a root.
    For x=7,63−67×7+126=469−169=0  
    Hence x=7   is also a root.

    2Thank You

    ANSWER
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