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CBSE Class 9 Answered

Find the value of a if x-a is a factor of  a)2x^3+x^2-17x+a b)x^5+a^2* x^3+2x+a+1
Asked by itishreepanda999 | 31 May, 2018, 10:55: AM
answered-by-expert Expert Answer
p(x)=2x3+x2-17x+a
p(a)=0....x=a
2a3+a2-17a+a=0
2a2+a-17+1=0
2a2+a-16=0
begin mathsize 16px style straight x equals fraction numerator negative straight b plus-or-minus square root of straight b squared minus 4 ac end root over denominator 2 straight a end fraction straight x equals fraction numerator negative 1 plus-or-minus square root of 1 squared minus 4 open parentheses 2 close parentheses open parentheses negative 16 close parentheses end root over denominator 4 end fraction straight x equals fraction numerator negative 1 plus-or-minus square root of 129 over denominator 4 end fraction end style


Answered by Arun | 31 May, 2018, 12:32: PM

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