Question

17. 2x² + x - 1 = 0 for class 10​

Answer 1

Answer:

Hi mate.

The roots are -1 and 1/2.

Step-by-step explanation:

2x^2 + x - 1 = 0

2x^2 + 2x - x - 1 = 0

2x(x+1) -1(x+1) = 0

(x+1) (2x -1) = 0

x = -1 or x = 1/2.

Hope you find this useful.

Answer 2

Step-by-step explanation:

2x2 + x - 1 = 0

2x2 + 2x - x - 1= 0

2x(x +1) - 1(x + 1)= 0

x+1 = 0 or 2x-1 =0

x = - 1 or x = 1/2