8x^2-11=-2x

Simple and best practice solution for 8x^2-11=-2x 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 8x^2-11=-2x equation:


Simplifying
8x2 + -11 = -2x

Reorder the terms:
-11 + 8x2 = -2x

Solving
-11 + 8x2 = -2x

Solving for variable 'x'.

Reorder the terms:
-11 + 2x + 8x2 = -2x + 2x

Combine like terms: -2x + 2x = 0
-11 + 2x + 8x2 = 0

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

Divide each side by '8'.
-1.375 + 0.25x + x2 = 0

Move the constant term to the right:

Add '1.375' to each side of the equation.
-1.375 + 0.25x + 1.375 + x2 = 0 + 1.375

Reorder the terms:
-1.375 + 1.375 + 0.25x + x2 = 0 + 1.375

Combine like terms: -1.375 + 1.375 = 0.000
0.000 + 0.25x + x2 = 0 + 1.375
0.25x + x2 = 0 + 1.375

Combine like terms: 0 + 1.375 = 1.375
0.25x + x2 = 1.375

The x term is 0.25x.  Take half its coefficient (0.125).
Square it (0.015625) and add it to both sides.

Add '0.015625' to each side of the equation.
0.25x + 0.015625 + x2 = 1.375 + 0.015625

Reorder the terms:
0.015625 + 0.25x + x2 = 1.375 + 0.015625

Combine like terms: 1.375 + 0.015625 = 1.390625
0.015625 + 0.25x + x2 = 1.390625

Factor a perfect square on the left side:
(x + 0.125)(x + 0.125) = 1.390625

Calculate the square root of the right side: 1.179247642

Break this problem into two subproblems by setting 
(x + 0.125) equal to 1.179247642 and -1.179247642.

Subproblem 1

x + 0.125 = 1.179247642 Simplifying x + 0.125 = 1.179247642 Reorder the terms: 0.125 + x = 1.179247642 Solving 0.125 + x = 1.179247642 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.125' to each side of the equation. 0.125 + -0.125 + x = 1.179247642 + -0.125 Combine like terms: 0.125 + -0.125 = 0.000 0.000 + x = 1.179247642 + -0.125 x = 1.179247642 + -0.125 Combine like terms: 1.179247642 + -0.125 = 1.054247642 x = 1.054247642 Simplifying x = 1.054247642

Subproblem 2

x + 0.125 = -1.179247642 Simplifying x + 0.125 = -1.179247642 Reorder the terms: 0.125 + x = -1.179247642 Solving 0.125 + x = -1.179247642 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.125' to each side of the equation. 0.125 + -0.125 + x = -1.179247642 + -0.125 Combine like terms: 0.125 + -0.125 = 0.000 0.000 + x = -1.179247642 + -0.125 x = -1.179247642 + -0.125 Combine like terms: -1.179247642 + -0.125 = -1.304247642 x = -1.304247642 Simplifying x = -1.304247642

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.054247642, -1.304247642}

See similar equations:

| 9x+13=3x-5 | | X+4.5=-6.6 | | x=0.5*9*5x+95 | | 3/4=x-1/6 | | 7=x-4y | | x=0.5t*9*5x+95 | | 4(3x-1)=2x/3 | | -12=-0.8k | | -x^3+12x+14=0 | | 3x+1=2(2x+2) | | 16=3x-6-2x | | 1/6=9x/224 | | a+2a=5a-48 | | 17+(9+10)=(17+9)+10 | | 7x^2+10-7=0 | | 121+2h=1013 | | 5y-11=13y+7 | | 9y+4=y+148 | | 197+2h=1057 | | 2x+10+7x-1=180 | | 6a^2+22a+12= | | 4x+12=5x-13 | | 23=2+3(x+3) | | 6x+6.8y=-3 | | 23x+11=540 | | H=-16t^2+80+3 | | 8y+8+y+46=180 | | 14-[3(12-10)+3-7]3= | | 2(z-1)=5(z+2)-3 | | cos^2x=sin^2x | | 19-12=x/3 | | 1/3(3-x)1/2(4-x) |

Equations solver categories