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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 5 years, 2 months ago

CBSE > Class 12 > Mathematics

1 answers

Yogita Ingle 5 years, 2 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.

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