x^2+8x+5=16

Simple and best practice solution for x^2+8x+5=16 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+8x+5=16 equation:


Simplifying
x2 + 8x + 5 = 16

Reorder the terms:
5 + 8x + x2 = 16

Solving
5 + 8x + x2 = 16

Solving for variable 'x'.

Reorder the terms:
5 + -16 + 8x + x2 = 16 + -16

Combine like terms: 5 + -16 = -11
-11 + 8x + x2 = 16 + -16

Combine like terms: 16 + -16 = 0
-11 + 8x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '11' to each side of the equation.
-11 + 8x + 11 + x2 = 0 + 11

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

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

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

The x term is 8x.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8x + 16 + x2 = 11 + 16

Reorder the terms:
16 + 8x + x2 = 11 + 16

Combine like terms: 11 + 16 = 27
16 + 8x + x2 = 27

Factor a perfect square on the left side:
(x + 4)(x + 4) = 27

Calculate the square root of the right side: 5.196152423

Break this problem into two subproblems by setting 
(x + 4) equal to 5.196152423 and -5.196152423.

Subproblem 1

x + 4 = 5.196152423 Simplifying x + 4 = 5.196152423 Reorder the terms: 4 + x = 5.196152423 Solving 4 + x = 5.196152423 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = 5.196152423 + -4 Combine like terms: 4 + -4 = 0 0 + x = 5.196152423 + -4 x = 5.196152423 + -4 Combine like terms: 5.196152423 + -4 = 1.196152423 x = 1.196152423 Simplifying x = 1.196152423

Subproblem 2

x + 4 = -5.196152423 Simplifying x + 4 = -5.196152423 Reorder the terms: 4 + x = -5.196152423 Solving 4 + x = -5.196152423 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = -5.196152423 + -4 Combine like terms: 4 + -4 = 0 0 + x = -5.196152423 + -4 x = -5.196152423 + -4 Combine like terms: -5.196152423 + -4 = -9.196152423 x = -9.196152423 Simplifying x = -9.196152423

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.196152423, -9.196152423}

See similar equations:

| 2+3f=-3f | | 2a-4=a+23 | | 5(4d-4-d)-6d= | | 5u-6=6u+38 | | 6x+47=-40 | | 5u-6=6u | | g+367=7g+5 | | 45=x+(x-6) | | -(2y+9y+9)= | | 576=-16t^2+192t | | .66(y-18)+.66(y+6)=-12 | | -9p+5=p+305 | | 6n-18=4n(n+2) | | -2=-4+u | | Y=2*0-2 | | 2y+4x-5=12 | | n+126=-3n+6 | | 5+35y=20y+17 | | x+3x-3=11 | | Y=1.5*6-2 | | Y=1.5*4-2 | | 315=21(6-x) | | Y=1.5*2-2 | | -2+2y=-6+16y | | Y=1.5*0-2 | | 2y+11=-69-8y | | 22x+2=21+5 | | -5+4u=15 | | Y=1.5*-2-2 | | 5(2x-3)-(x+4)=21 | | 45-6y=9-10y | | 6x+3y-10=2y-8x+3 |

Equations solver categories