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if ( x+2) is a factor of x2+ax+2b and a+b=4 , then what will be the value of a

Posted by Shilpa Jain 7 years, 3 months ago

CBSE > Class 10 > Mathematics

1 answers

Jatin Garg 7 years, 3 months ago

X+2=0 Gives,x=-2 Put in x2+ax+2b=0 as x+2 is a factor of the given eq. And remainder would be zero. Then after solving this we would get 2a-2b=4 or a-b=2 and we will asume it as eq1 Also other eq.has been given that is a+b=4 eq.2 Solving eq 1and 2 by elemination method a-b=2 a+b=4 Will give 2a=6 a=6÷2 Therefore,a=3

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CBSE > Class 10 > Mathematics

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CBSE > Class 10 > Mathematics