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Question
If 3 is a zero of the polynomial x2+2xāa, then find a.
If 3 is a zero of the polynomial x2+2xāa, then find a.
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Solution
The correct option is C 15
Let p(x)=x2+2x−a
As the zero of this polynomial is 3, we know that p(3)=0.
x2+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
Let p(x)=x2+2x−a
As the zero of this polynomial is 3, we know that p(3)=0.
x2+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
⇒9+6−a=0
⇒15−a=0
⇒−a=−15
⇒a=15
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are zeroes of the polynomial x2 ā 2x ā 15, then form a quadratic polynomial whose zeroes are (2