x-4=x^2-8x-16

Simple and best practice solution for x-4=x^2-8x-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-4=x^2-8x-16 equation:


Simplifying
x + -4 = x2 + -8x + -16

Reorder the terms:
-4 + x = x2 + -8x + -16

Reorder the terms:
-4 + x = -16 + -8x + x2

Solving
-4 + x = -16 + -8x + x2

Solving for variable 'x'.

Reorder the terms:
-4 + 16 + x + 8x + -1x2 = -16 + -8x + x2 + 16 + 8x + -1x2

Combine like terms: -4 + 16 = 12
12 + x + 8x + -1x2 = -16 + -8x + x2 + 16 + 8x + -1x2

Combine like terms: x + 8x = 9x
12 + 9x + -1x2 = -16 + -8x + x2 + 16 + 8x + -1x2

Reorder the terms:
12 + 9x + -1x2 = -16 + 16 + -8x + 8x + x2 + -1x2

Combine like terms: -16 + 16 = 0
12 + 9x + -1x2 = 0 + -8x + 8x + x2 + -1x2
12 + 9x + -1x2 = -8x + 8x + x2 + -1x2

Combine like terms: -8x + 8x = 0
12 + 9x + -1x2 = 0 + x2 + -1x2
12 + 9x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
12 + 9x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-12 + -9x + x2 = 0

Move the constant term to the right:

Add '12' to each side of the equation.
-12 + -9x + 12 + x2 = 0 + 12

Reorder the terms:
-12 + 12 + -9x + x2 = 0 + 12

Combine like terms: -12 + 12 = 0
0 + -9x + x2 = 0 + 12
-9x + x2 = 0 + 12

Combine like terms: 0 + 12 = 12
-9x + x2 = 12

The x term is -9x.  Take half its coefficient (-4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
-9x + 20.25 + x2 = 12 + 20.25

Reorder the terms:
20.25 + -9x + x2 = 12 + 20.25

Combine like terms: 12 + 20.25 = 32.25
20.25 + -9x + x2 = 32.25

Factor a perfect square on the left side:
(x + -4.5)(x + -4.5) = 32.25

Calculate the square root of the right side: 5.678908346

Break this problem into two subproblems by setting 
(x + -4.5) equal to 5.678908346 and -5.678908346.

Subproblem 1

x + -4.5 = 5.678908346 Simplifying x + -4.5 = 5.678908346 Reorder the terms: -4.5 + x = 5.678908346 Solving -4.5 + x = 5.678908346 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + x = 5.678908346 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + x = 5.678908346 + 4.5 x = 5.678908346 + 4.5 Combine like terms: 5.678908346 + 4.5 = 10.178908346 x = 10.178908346 Simplifying x = 10.178908346

Subproblem 2

x + -4.5 = -5.678908346 Simplifying x + -4.5 = -5.678908346 Reorder the terms: -4.5 + x = -5.678908346 Solving -4.5 + x = -5.678908346 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + x = -5.678908346 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + x = -5.678908346 + 4.5 x = -5.678908346 + 4.5 Combine like terms: -5.678908346 + 4.5 = -1.178908346 x = -1.178908346 Simplifying x = -1.178908346

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.178908346, -1.178908346}

See similar equations:

| 3x-7=-11 | | 4x^2-15x+23=5x+2 | | 8d^2+10d-3= | | 3x+5x+4=2x+4x+28 | | -19+74=-5(x+3) | | x^2=0.01x | | x+x+1+x+2=x+x+1+x+x+1 | | w^2-15w+14= | | 5u*53=4+200 | | U-9=-7u+9 | | 14x+7=18x-19x | | 9v+v-2v+4v-4v=16 | | 3s+-10s+-8s=15 | | 10q+5q-13q-q=9 | | -3x+-17x-x-10x=18 | | r^2+25=0 | | 3j-2j=4 | | 8u-(-10)= | | 2s-s+3s=20 | | y=-21x+290 | | 5x+36=2x+9 | | 7x+9=4x+c | | 3x+3x+3x=x | | 7k+2k-9k+k=6 | | 19v-4v-2v-9v+v=15 | | 18d-6d-7d=10 | | 11y+2y-9y-y-y=8 | | 3(x+3)=6+5(7-x) | | 3j-2j=11 | | 3p+4b=375 | | 10y-9=4y+26 | | 14x^3+10x^2-4x=0 |

Equations solver categories