x^2-16x-55=0

Simple and best practice solution for x^2-16x-55=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 x^2-16x-55=0 equation:


Simplifying
x2 + -16x + -55 = 0

Reorder the terms:
-55 + -16x + x2 = 0

Solving
-55 + -16x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '55' to each side of the equation.
-55 + -16x + 55 + x2 = 0 + 55

Reorder the terms:
-55 + 55 + -16x + x2 = 0 + 55

Combine like terms: -55 + 55 = 0
0 + -16x + x2 = 0 + 55
-16x + x2 = 0 + 55

Combine like terms: 0 + 55 = 55
-16x + x2 = 55

The x term is -16x.  Take half its coefficient (-8).
Square it (64) and add it to both sides.

Add '64' to each side of the equation.
-16x + 64 + x2 = 55 + 64

Reorder the terms:
64 + -16x + x2 = 55 + 64

Combine like terms: 55 + 64 = 119
64 + -16x + x2 = 119

Factor a perfect square on the left side:
(x + -8)(x + -8) = 119

Calculate the square root of the right side: 10.908712115

Break this problem into two subproblems by setting 
(x + -8) equal to 10.908712115 and -10.908712115.

Subproblem 1

x + -8 = 10.908712115 Simplifying x + -8 = 10.908712115 Reorder the terms: -8 + x = 10.908712115 Solving -8 + x = 10.908712115 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + x = 10.908712115 + 8 Combine like terms: -8 + 8 = 0 0 + x = 10.908712115 + 8 x = 10.908712115 + 8 Combine like terms: 10.908712115 + 8 = 18.908712115 x = 18.908712115 Simplifying x = 18.908712115

Subproblem 2

x + -8 = -10.908712115 Simplifying x + -8 = -10.908712115 Reorder the terms: -8 + x = -10.908712115 Solving -8 + x = -10.908712115 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + x = -10.908712115 + 8 Combine like terms: -8 + 8 = 0 0 + x = -10.908712115 + 8 x = -10.908712115 + 8 Combine like terms: -10.908712115 + 8 = -2.908712115 x = -2.908712115 Simplifying x = -2.908712115

Solution

The solution to the problem is based on the solutions from the subproblems. x = {18.908712115, -2.908712115}

See similar equations:

| 12=t(100000)/500(20) | | (7-3x)/4=2 | | 14+5x+3= | | 4=x^2-4x | | 2x/6-11=(-4)-7 | | 48=1/2(140-x) | | 12=t(200000-100000)/500(20) | | 6(2x-7)-6=-(2x+1) | | 2x^4-8x^2+10=0 | | 12=x(200000-100000)/500(20) | | (2x+5)+3(x+2)= | | 6(2t-4)+48-6t= | | 1-2(x-2)=6y+1 | | Y-3=-2(x+8) | | 7(2+7)=5r+59 | | n^2-3n-51=3 | | 5a-9-5= | | (1/5)*(10x-25)=(1/2)*(10x-4) | | X+3=3y-1 | | 14x-6=y | | (3x+4)-(1x-4)= | | 7x-7(-5x-8)=-154 | | 2x+(3x-29)=180 | | 4x-6+7x=12-6 | | 3x^2-3x=-4 | | -88=-9a-7 | | r/8.04=1.55 | | h(-2)=-2(4)+4 | | -3n-2=-4n-11 | | 151=8v+7 | | 3y+7-10=5 | | z=6z^2 |

Equations solver categories