-x^2-8x+3=0

Simple and best practice solution for -x^2-8x+3=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^2-8x+3=0 equation:


Simplifying
-1x2 + -8x + 3 = 0

Reorder the terms:
3 + -8x + -1x2 = 0

Solving
3 + -8x + -1x2 = 0

Solving for variable 'x'.

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

Divide each side by '-1'.
-3 + 8x + x2 = 0

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + 8x + 3 + x2 = 0 + 3

Reorder the terms:
-3 + 3 + 8x + x2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + 8x + x2 = 0 + 3
8x + x2 = 0 + 3

Combine like terms: 0 + 3 = 3
8x + x2 = 3

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 = 3 + 16

Reorder the terms:
16 + 8x + x2 = 3 + 16

Combine like terms: 3 + 16 = 19
16 + 8x + x2 = 19

Factor a perfect square on the left side:
(x + 4)(x + 4) = 19

Calculate the square root of the right side: 4.358898944

Break this problem into two subproblems by setting 
(x + 4) equal to 4.358898944 and -4.358898944.

Subproblem 1

x + 4 = 4.358898944 Simplifying x + 4 = 4.358898944 Reorder the terms: 4 + x = 4.358898944 Solving 4 + x = 4.358898944 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 = 4.358898944 + -4 Combine like terms: 4 + -4 = 0 0 + x = 4.358898944 + -4 x = 4.358898944 + -4 Combine like terms: 4.358898944 + -4 = 0.358898944 x = 0.358898944 Simplifying x = 0.358898944

Subproblem 2

x + 4 = -4.358898944 Simplifying x + 4 = -4.358898944 Reorder the terms: 4 + x = -4.358898944 Solving 4 + x = -4.358898944 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 = -4.358898944 + -4 Combine like terms: 4 + -4 = 0 0 + x = -4.358898944 + -4 x = -4.358898944 + -4 Combine like terms: -4.358898944 + -4 = -8.358898944 x = -8.358898944 Simplifying x = -8.358898944

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.358898944, -8.358898944}

See similar equations:

| 4+1=3+m | | (-8a)x(-3b)=-24ab | | C-c+2c=12 | | 3d-8=19 | | 5k-4k+5k-5k=12 | | 3k-16=14 | | 2y-y=14 | | 25=5a | | 0=x+4x-5 | | 19p-18p=11 | | 11=12b | | 4c-3c=20 | | 4(y-5)+6y=30 | | 3-x=x+17 | | 5x^2-30x+46=0 | | 6b-b=20 | | 6m-4m=10 | | -4-16=-6u+u | | 5m-3m=18 | | (-8a)x(-3b)= | | 2(-6x+7)=134 | | 4a=60 | | a*a+b*b= | | 15m-9m=18 | | y=3x^2+6x+3 | | 3x+18=13x+82 | | Q/4=6 | | 27+c=59 | | 5(4x+1)=-15/2 | | A-27= | | 6(3-x)=-12 | | 7+3s-6=6s+7-2s |

Equations solver categories