8x^2-11x-11=0

Simple and best practice solution for 8x^2-11x-11=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 8x^2-11x-11=0 equation:


Simplifying
8x2 + -11x + -11 = 0

Reorder the terms:
-11 + -11x + 8x2 = 0

Solving
-11 + -11x + 8x2 = 0

Solving for variable 'x'.

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

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

Move the constant term to the right:

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

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

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

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

The x term is -1.375x.  Take half its coefficient (-0.6875).
Square it (0.47265625) and add it to both sides.

Add '0.47265625' to each side of the equation.
-1.375x + 0.47265625 + x2 = 1.375 + 0.47265625

Reorder the terms:
0.47265625 + -1.375x + x2 = 1.375 + 0.47265625

Combine like terms: 1.375 + 0.47265625 = 1.84765625
0.47265625 + -1.375x + x2 = 1.84765625

Factor a perfect square on the left side:
(x + -0.6875)(x + -0.6875) = 1.84765625

Calculate the square root of the right side: 1.359285198

Break this problem into two subproblems by setting 
(x + -0.6875) equal to 1.359285198 and -1.359285198.

Subproblem 1

x + -0.6875 = 1.359285198 Simplifying x + -0.6875 = 1.359285198 Reorder the terms: -0.6875 + x = 1.359285198 Solving -0.6875 + x = 1.359285198 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.6875' to each side of the equation. -0.6875 + 0.6875 + x = 1.359285198 + 0.6875 Combine like terms: -0.6875 + 0.6875 = 0.0000 0.0000 + x = 1.359285198 + 0.6875 x = 1.359285198 + 0.6875 Combine like terms: 1.359285198 + 0.6875 = 2.046785198 x = 2.046785198 Simplifying x = 2.046785198

Subproblem 2

x + -0.6875 = -1.359285198 Simplifying x + -0.6875 = -1.359285198 Reorder the terms: -0.6875 + x = -1.359285198 Solving -0.6875 + x = -1.359285198 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.6875' to each side of the equation. -0.6875 + 0.6875 + x = -1.359285198 + 0.6875 Combine like terms: -0.6875 + 0.6875 = 0.0000 0.0000 + x = -1.359285198 + 0.6875 x = -1.359285198 + 0.6875 Combine like terms: -1.359285198 + 0.6875 = -0.671785198 x = -0.671785198 Simplifying x = -0.671785198

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.046785198, -0.671785198}

See similar equations:

| 9(z+4)=8z | | 1/3/1/3 | | 3y+7=2y-1 | | 24+5h=10 | | 4x+2x=5x-4 | | x*6x=0.06 | | 5e^3x=14 | | 148=-16t^2+96t+12 | | (5e^3x)+7=21 | | 3(y-6)=2(y-5) | | log(18x)=2log(6) | | 3x^2-6x-27=0 | | 0=-16t^2+29t+0 | | 0=-16t^2+29t+s | | -cos^2x-2x+4-m=0 | | h(t)=-16t^2+95t+150 | | h(t)=-16t^2+16t+32 | | 14x^2+53x+14=0 | | x*2x=1500 | | 3a-3(a-2)=2(3a-2) | | 0=-16t^2+95t+150 | | 3y-12=2y+7 | | h=-16t^2+95+150 | | (9x-5x+1)-(x-7x+5)= | | -8x-8y=48 | | x(x+1)=x+(x+1)+11 | | 5=4f+16 | | 29x(x+3)=3770 | | 9=3x*x+x+5 | | 5=-2(x+4) | | 29(x+3)=3770 | | r(r+4)=60 |

Equations solver categories