Use the quadratic formula to find both solutions to the quadratic equation
given below.
2x2 + x -1 = 0

Step-by-step explanation:

2x² + x -1 = 0

x² + x² + x -1 = 0

(x²  - 1) + x²  + x  =0

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

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

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

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.

c

step-by-step explanation: