-2x^2-x-0.12=0

Simple and best practice solution for -2x^2-x-0.12=0 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-0.12=0 equation:


Simplifying
-2x2 + -1x + -0.12 = 0

Reorder the terms:
-0.12 + -1x + -2x2 = 0

Solving
-0.12 + -1x + -2x2 = 0

Solving for variable 'x'.

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

Divide each side by '-2'.
0.06 + 0.5x + x2 = 0

Move the constant term to the right:

Add '-0.06' to each side of the equation.
0.06 + 0.5x + -0.06 + x2 = 0 + -0.06

Reorder the terms:
0.06 + -0.06 + 0.5x + x2 = 0 + -0.06

Combine like terms: 0.06 + -0.06 = 0.00
0.00 + 0.5x + x2 = 0 + -0.06
0.5x + x2 = 0 + -0.06

Combine like terms: 0 + -0.06 = -0.06
0.5x + x2 = -0.06

The x term is 0.5x.  Take half its coefficient (0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
0.5x + 0.0625 + x2 = -0.06 + 0.0625

Reorder the terms:
0.0625 + 0.5x + x2 = -0.06 + 0.0625

Combine like terms: -0.06 + 0.0625 = 0.0025
0.0625 + 0.5x + x2 = 0.0025

Factor a perfect square on the left side:
(x + 0.25)(x + 0.25) = 0.0025

Calculate the square root of the right side: 0.05

Break this problem into two subproblems by setting 
(x + 0.25) equal to 0.05 and -0.05.

Subproblem 1

x + 0.25 = 0.05 Simplifying x + 0.25 = 0.05 Reorder the terms: 0.25 + x = 0.05 Solving 0.25 + x = 0.05 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + x = 0.05 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = 0.05 + -0.25 x = 0.05 + -0.25 Combine like terms: 0.05 + -0.25 = -0.2 x = -0.2 Simplifying x = -0.2

Subproblem 2

x + 0.25 = -0.05 Simplifying x + 0.25 = -0.05 Reorder the terms: 0.25 + x = -0.05 Solving 0.25 + x = -0.05 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + x = -0.05 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = -0.05 + -0.25 x = -0.05 + -0.25 Combine like terms: -0.05 + -0.25 = -0.3 x = -0.3 Simplifying x = -0.3

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.2, -0.3}

See similar equations:

| 5+0.25*100=x | | 65+195x=1820 | | -4(-3x+4)-5x=-65 | | 6a^2+12a-72=-6 | | X-7=4x-13 | | 5x-7x+4=28 | | X+5+11x=12+y | | 2x^2+4x+2=40 | | x/3=4.8 | | 20+0.15*100=x | | 9x^2=18-5x | | 3y+6x+9=12 | | 9x^2+5x=18 | | 20+0.15*100= | | -2y+4=18 | | -x=3x-20 | | 4x+2x-10=86 | | 8(m+7)=9(m) | | H(t)=-16t^2+60(60) | | 0.5x+3*6=4 | | P/8=-2 | | 13x-4=100 | | -2.5n+1.2=-8.3 | | x-25=-12 | | 1/8w-13-6 | | (M-n)x+(m-n)x=2m^2 | | n/z-9=-5 | | X+2X-2-7=5X+20 | | 4(p+2)=30 | | -5(c-3)=-25 | | 1.5a+6=9+12 | | 55=4v-9 |

Equations solver categories