B )
If 3 is a zero of a polynomial x² + 2x - a, then value of a.
A ) 1 / 15.
B ) 15.
C ) - 15.
D ) - 1 / 15.
We have, Polynomial.
Compare With general expression.
Where as,
__________________
Putting the value of a = 3.
Answer:
Let p(x)=x
2
+2x−a
As the zero of this polynomial is 3, we know that p(3)=0.
x
+2x−a=0
Put x=3, we get
(3)
+2(3)−a=0
⇒9+6−a=0
⇒15−a=0
⇒−a=−15
⇒a=15
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Answers & Comments
AnsWer :
B )
QuestioN :
If 3 is a zero of a polynomial x² + 2x - a, then value of a.
A ) 1 / 15.
B ) 15.
C ) - 15.
D ) - 1 / 15.
SolutioN :
We have, Polynomial.
Compare With general expression.
Where as,
__________________
Putting the value of a = 3.
Therefore, the value of a is 15.
Verified answer
Answer:
Let p(x)=x
2
+2x−a
As the zero of this polynomial is 3, we know that p(3)=0.
x
2
+2x−a=0
Put x=3, we get
(3)
2
+2(3)−a=0
⇒9+6−a=0
⇒15−a=0
⇒−a=−15
⇒a=15