Question

solve by formula mathod : 2x²+ x-1/5=0​

Answer 1

Answer:

Step-by-step explanation:

On comparing this equation with ax  

2

+bx+c=0, where a=2,b=3,c=1

∴ b  

2

−4ac=(5)  

2

−4×2×1

=9−8

=1

x=  

2a

−b±  

b  

2

−4ac

​

 

​

 

=  

2×2

−3±  

1

​

 

​

 

x=  

4

−3+1

​

 or x=  

4

−3−1

​

 

x=  

4

−2

​

 or x=  

4

−4

​

 

x=  

2

−1

​

 or x=−1