(8-x)*x=5

Simple and best practice solution for (8-x)*x=5 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 (8-x)*x=5 equation:


Simplifying
(8 + -1x) * x = 5

Reorder the terms for easier multiplication:
x(8 + -1x) = 5
(8 * x + -1x * x) = 5
(8x + -1x2) = 5

Solving
8x + -1x2 = 5

Solving for variable 'x'.

Reorder the terms:
-5 + 8x + -1x2 = 5 + -5

Combine like terms: 5 + -5 = 0
-5 + 8x + -1x2 = 0

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

Divide each side by '-1'.
5 + -8x + x2 = 0

Move the constant term to the right:

Add '-5' to each side of the equation.
5 + -8x + -5 + x2 = 0 + -5

Reorder the terms:
5 + -5 + -8x + x2 = 0 + -5

Combine like terms: 5 + -5 = 0
0 + -8x + x2 = 0 + -5
-8x + x2 = 0 + -5

Combine like terms: 0 + -5 = -5
-8x + x2 = -5

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 = -5 + 16

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

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

Factor a perfect square on the left side:
(x + -4)(x + -4) = 11

Calculate the square root of the right side: 3.31662479

Break this problem into two subproblems by setting 
(x + -4) equal to 3.31662479 and -3.31662479.

Subproblem 1

x + -4 = 3.31662479 Simplifying x + -4 = 3.31662479 Reorder the terms: -4 + x = 3.31662479 Solving -4 + x = 3.31662479 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 = 3.31662479 + 4 Combine like terms: -4 + 4 = 0 0 + x = 3.31662479 + 4 x = 3.31662479 + 4 Combine like terms: 3.31662479 + 4 = 7.31662479 x = 7.31662479 Simplifying x = 7.31662479

Subproblem 2

x + -4 = -3.31662479 Simplifying x + -4 = -3.31662479 Reorder the terms: -4 + x = -3.31662479 Solving -4 + x = -3.31662479 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 = -3.31662479 + 4 Combine like terms: -4 + 4 = 0 0 + x = -3.31662479 + 4 x = -3.31662479 + 4 Combine like terms: -3.31662479 + 4 = 0.68337521 x = 0.68337521 Simplifying x = 0.68337521

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.31662479, 0.68337521}

See similar equations:

| 4x+33=13x-4 | | 2x^3-14x^2+33x+2=0 | | y=-x^2+6x-4 | | 7p-3=0.75(8p-12) | | 2(x+3)-7=6-5(x+1) | | 0.20(15n+5)=8n-9 | | X^2-6=75 | | 5+2x=20+4x | | 2x^3+6x^2+11x-14=0 | | 4+2/5+3+5/10= | | t^2-t-42=0 | | X=1y+2 | | 0.6(x-0.4)=3.6 | | 12*(x-4)=72 | | t^2-14t+24=0 | | -m-30=-6 | | 5(x-3)+6=1 | | 5x-i(x-5)=13 | | r^2+15r+56=0 | | 3x^2+2x=7 | | 27+6y=9y-12 | | 5y-3+2y=3y+9 | | 0=x^2-x-156 | | 4z(z-1)=15 | | 2ln(3x+1)-ln(x+1)=ln(7x+4) | | 3x-85+4x=55 | | 3x+10=-81-10x | | X-5-2x=11 | | 8x=-5x | | 4x^2+13X-36=0 | | 4x^2+13X=36 | | 3z=n^2 |

Equations solver categories