Question

If one zero of the polynomial 7 x 2 – 50 x + 7 is 7 , then the other zero is ( a ) 7 ( b ) 1/7 ( c ) – 1/7 ( d ) None of these​

Answer 1

Answer:

Explanation:Correct option is B  

​

 

To find the zero of 2x  

2

+7x−4 is same as solving the equation 2x  

2

+7x−4=0

⇒2x  

2

+8x−x−4=0

⇒2x(x+4)−1(x+4)=0

⇒(2x−1)(x+4)=0

⇒(2x−1)=0,(x+4)=0

⇒x=  

2

1

​

,−4

Therefore, option B is correct

 

​

 

To find the zero of 2x  

2

+7x−4 is same as solving the equation 2x  

2

+7x−4=0

⇒2x  

2

+8x−x−4=0

⇒2x(x+4)−1(x+4)=0

⇒(2x−1)(x+4)=0

⇒(2x−1)=0,(x+4)=0

⇒x=  

2

1

​

,−4

Therefore, option B is correct.