2x^2+x-1=-2

Simple and best practice solution for 2x^2+x-1=-2 equation. Check how easy it is, and learn it for the future. Our solution is simple, and easy to understand, so don`t hesitate to use it as a solution of your homework.

If it's not what You are looking for type in the equation solver your own equation and let us solve it.

Solution for 2x^2+x-1=-2 equation:


Simplifying
2x2 + x + -1 = -2

Reorder the terms:
-1 + x + 2x2 = -2

Solving
-1 + x + 2x2 = -2

Solving for variable 'x'.

Reorder the terms:
-1 + 2 + x + 2x2 = -2 + 2

Combine like terms: -1 + 2 = 1
1 + x + 2x2 = -2 + 2

Combine like terms: -2 + 2 = 0
1 + x + 2x2 = 0

Begin completing the square.  Divide all terms by
2 the coefficient of the squared term: 

Divide each side by '2'.
0.5 + 0.5x + x2 = 0

Move the constant term to the right:

Add '-0.5' to each side of the equation.
0.5 + 0.5x + -0.5 + x2 = 0 + -0.5

Reorder the terms:
0.5 + -0.5 + 0.5x + x2 = 0 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
0.0 + 0.5x + x2 = 0 + -0.5
0.5x + x2 = 0 + -0.5

Combine like terms: 0 + -0.5 = -0.5
0.5x + x2 = -0.5

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
0.5x + 0.25 + x2 = -0.5 + 0.25

Reorder the terms:
0.25 + 0.5x + x2 = -0.5 + 0.25

Combine like terms: -0.5 + 0.25 = -0.25
0.25 + 0.5x + x2 = -0.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = -0.25

Can't calculate square root of the right side.

The solution to this equation could not be determined.

See similar equations:

| 9m+10=21 | | 3/7(14-3)=3 | | s/11=2 | | 8/11=2 | | (3x-8)(8)=16 | | log^3(5x-7)=4 | | 5x-11=6x+12 | | (-3x-8)(-x)=16 | | x+(x*0.15)=37 | | 5/9=43/n | | 2x-15/3x | | a/3-1=2(a-13) | | logx(4y)=5 | | 7+8x=-33 | | ln(x)=4ln(y) | | 5x-1*6x= | | 5x(x-1)=30 | | 6x/2x-1 | | F(x)=x^3-3x^2-9x | | 3+4x=2x+23 | | x^2=13x+558 | | 4+9=29 | | 3y+6y=y-2 | | 2(v-3)=10 | | 4(m+2)=24 | | 26=5/9(77-32) | | 4x-2(28-x)=98 | | 3(p+3)=27 | | 2logx+log(6-x^2)=0 | | 3(p+3)=25 | | 4x^2-15x+18x=0 | | P=3.141592654*6.7+2r+2a |

Equations solver categories