11x^2+x-400=0

Simple and best practice solution for 11x^2+x-400=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 11x^2+x-400=0 equation:


Simplifying
11x2 + x + -400 = 0

Reorder the terms:
-400 + x + 11x2 = 0

Solving
-400 + x + 11x2 = 0

Solving for variable 'x'.

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

Divide each side by '11'.
-36.36363636 + 0.09090909091x + x2 = 0

Move the constant term to the right:

Add '36.36363636' to each side of the equation.
-36.36363636 + 0.09090909091x + 36.36363636 + x2 = 0 + 36.36363636

Reorder the terms:
-36.36363636 + 36.36363636 + 0.09090909091x + x2 = 0 + 36.36363636

Combine like terms: -36.36363636 + 36.36363636 = 0.00000000
0.00000000 + 0.09090909091x + x2 = 0 + 36.36363636
0.09090909091x + x2 = 0 + 36.36363636

Combine like terms: 0 + 36.36363636 = 36.36363636
0.09090909091x + x2 = 36.36363636

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.
0.09090909091x + 0.25 + x2 = 36.36363636 + 0.25

Reorder the terms:
0.25 + 0.09090909091x + x2 = 36.36363636 + 0.25

Combine like terms: 36.36363636 + 0.25 = 36.61363636
0.25 + 0.09090909091x + x2 = 36.61363636

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 36.61363636

Calculate the square root of the right side: 6.05092029

Break this problem into two subproblems by setting 
(x + 0.5) equal to 6.05092029 and -6.05092029.

Subproblem 1

x + 0.5 = 6.05092029 Simplifying x + 0.5 = 6.05092029 Reorder the terms: 0.5 + x = 6.05092029 Solving 0.5 + x = 6.05092029 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 6.05092029 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 6.05092029 + -0.5 x = 6.05092029 + -0.5 Combine like terms: 6.05092029 + -0.5 = 5.55092029 x = 5.55092029 Simplifying x = 5.55092029

Subproblem 2

x + 0.5 = -6.05092029 Simplifying x + 0.5 = -6.05092029 Reorder the terms: 0.5 + x = -6.05092029 Solving 0.5 + x = -6.05092029 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -6.05092029 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -6.05092029 + -0.5 x = -6.05092029 + -0.5 Combine like terms: -6.05092029 + -0.5 = -6.55092029 x = -6.55092029 Simplifying x = -6.55092029

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.55092029, -6.55092029}

See similar equations:

| 22=12-2a | | 0=5x^2-16x-3 | | 7(3x-5)=-161 | | x+53=x+139 | | 13x-7=5x+11x | | x^2-x-44=12 | | 16(-3x+9)=12(-4-4x) | | -3(5x-1)=-12 | | 2(-2+3x)=14 | | 20x^4+16x^3-5x-4=0 | | 18m+50=11940 | | -y/4=4 | | 7(x-2)+2=7x-11 | | y-45=16y | | 4.75+(-2)+(-6.25)= | | 16-9y=15 | | -5-6x=2x-53 | | 20x^2+16x^3-5x-4=0 | | 7+7x=x+31 | | 2.65+8.6u=7.2u-5.15+0.4u | | 7(x-4)+13=7x-15 | | T=6+2.50h | | 3w-11=42 | | 12m+150=11380.80 | | -6x+6=-5x+18 | | sqr-x-1=4 | | 0.9-0.5x+9=-5 | | 7w+19=-11+9w-4w | | -4+5x-7x=-10 | | .6X+17=42 | | 10ln(3x-1)=50 | | 43=2x-6x+7 |

Equations solver categories