Question

solve the quadratic eqiation 2x²—r—1=0 by the method of factorism​

Answer 1

Step-by-step explanation:

Given 2x

2

+3x+1=0

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