2x^2-11x-8=0

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


Simplifying
2x2 + -11x + -8 = 0

Reorder the terms:
-8 + -11x + 2x2 = 0

Solving
-8 + -11x + 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'.
-4 + -5.5x + x2 = 0

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + -5.5x + 4 + x2 = 0 + 4

Reorder the terms:
-4 + 4 + -5.5x + x2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + -5.5x + x2 = 0 + 4
-5.5x + x2 = 0 + 4

Combine like terms: 0 + 4 = 4
-5.5x + x2 = 4

The x term is -5.5x.  Take half its coefficient (-2.75).
Square it (7.5625) and add it to both sides.

Add '7.5625' to each side of the equation.
-5.5x + 7.5625 + x2 = 4 + 7.5625

Reorder the terms:
7.5625 + -5.5x + x2 = 4 + 7.5625

Combine like terms: 4 + 7.5625 = 11.5625
7.5625 + -5.5x + x2 = 11.5625

Factor a perfect square on the left side:
(x + -2.75)(x + -2.75) = 11.5625

Calculate the square root of the right side: 3.400367627

Break this problem into two subproblems by setting 
(x + -2.75) equal to 3.400367627 and -3.400367627.

Subproblem 1

x + -2.75 = 3.400367627 Simplifying x + -2.75 = 3.400367627 Reorder the terms: -2.75 + x = 3.400367627 Solving -2.75 + x = 3.400367627 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.75' to each side of the equation. -2.75 + 2.75 + x = 3.400367627 + 2.75 Combine like terms: -2.75 + 2.75 = 0.00 0.00 + x = 3.400367627 + 2.75 x = 3.400367627 + 2.75 Combine like terms: 3.400367627 + 2.75 = 6.150367627 x = 6.150367627 Simplifying x = 6.150367627

Subproblem 2

x + -2.75 = -3.400367627 Simplifying x + -2.75 = -3.400367627 Reorder the terms: -2.75 + x = -3.400367627 Solving -2.75 + x = -3.400367627 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.75' to each side of the equation. -2.75 + 2.75 + x = -3.400367627 + 2.75 Combine like terms: -2.75 + 2.75 = 0.00 0.00 + x = -3.400367627 + 2.75 x = -3.400367627 + 2.75 Combine like terms: -3.400367627 + 2.75 = -0.650367627 x = -0.650367627 Simplifying x = -0.650367627

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.150367627, -0.650367627}

See similar equations:

| 50+17.50x=24.50x | | 17.50x+50=24.50x | | 132p+132+11p=275 | | X+y=3x-4y | | 5b+13=-17 | | 3.2=17-3f | | 7x/-2 | | N+11= | | -7=3x+2 | | 19+x=45 | | v^2-7v-6=0 | | -2(y+2)= | | 2(4x+4)=6(x-4) | | (13x-31)=(x+53) | | ax=-3 | | F(x)=x*ln(5x+3) | | 14x^2+36x=0 | | 11x-3+4x+39=180 | | 8x*x=512 | | X^2=2048 | | 5+3(9-4)=-11-2(9+1) | | 12+2=-8 | | 12+-2=-8 | | 4w-2(w-4)= | | 2w^2+17w+8=0 | | x=1,15/y | | 3w+8-w= | | 6-x+3=18 | | 5a+3whena=9 | | 2008=x^2 | | 5K^2+22K+50=0 | | (2+6i)-(5-8i)= |

Equations solver categories