x^2=9x-1

Simple and best practice solution for x^2=9x-1 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=9x-1 equation:


Simplifying
x2 = 9x + -1

Reorder the terms:
x2 = -1 + 9x

Solving
x2 = -1 + 9x

Solving for variable 'x'.

Reorder the terms:
1 + -9x + x2 = -1 + 9x + 1 + -9x

Reorder the terms:
1 + -9x + x2 = -1 + 1 + 9x + -9x

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

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

Begin completing the square.

Move the constant term to the right:

Add '-1' to each side of the equation.
1 + -9x + -1 + x2 = 0 + -1

Reorder the terms:
1 + -1 + -9x + x2 = 0 + -1

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

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

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 = -1 + 20.25

Reorder the terms:
20.25 + -9x + x2 = -1 + 20.25

Combine like terms: -1 + 20.25 = 19.25
20.25 + -9x + x2 = 19.25

Factor a perfect square on the left side:
(x + -4.5)(x + -4.5) = 19.25

Calculate the square root of the right side: 4.387482194

Break this problem into two subproblems by setting 
(x + -4.5) equal to 4.387482194 and -4.387482194.

Subproblem 1

x + -4.5 = 4.387482194 Simplifying x + -4.5 = 4.387482194 Reorder the terms: -4.5 + x = 4.387482194 Solving -4.5 + x = 4.387482194 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 = 4.387482194 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + x = 4.387482194 + 4.5 x = 4.387482194 + 4.5 Combine like terms: 4.387482194 + 4.5 = 8.887482194 x = 8.887482194 Simplifying x = 8.887482194

Subproblem 2

x + -4.5 = -4.387482194 Simplifying x + -4.5 = -4.387482194 Reorder the terms: -4.5 + x = -4.387482194 Solving -4.5 + x = -4.387482194 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 = -4.387482194 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + x = -4.387482194 + 4.5 x = -4.387482194 + 4.5 Combine like terms: -4.387482194 + 4.5 = 0.112517806 x = 0.112517806 Simplifying x = 0.112517806

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.887482194, 0.112517806}

See similar equations:

| Z+(z+3)=13 | | -3x-1=x-14 | | 5(2X+15)-9X=69 | | 3n+2=4 | | x2/3-8x1/3+15=0 | | 6x-15=4x+7 | | (13-z)+2=5 | | (1/10)+(4/9)/(1/5)+(5/9) | | 2x-x^2=-15 | | 14+7x=2x-11 | | (-3x)-(-13)=5 | | y+14y+13=0 | | 14x-13=3+2x+8 | | 1/8a=7 | | 2*2(4*4)+6*6-6= | | x/3+x/5=8/5 | | 3=2x+-3 | | (13-z)+2=18 | | 48p+30q= | | 2x^5=72x^3 | | 11y/14 | | y-.8=4.75 | | (9x-8)-(x+4)= | | -a/9=11/30 | | 6z=18+3z | | 7875/175 | | 4x+4=-x^2 | | 4(x-2)-2(x+11)=4 | | 3y/5-y/5 | | 5f+10=9+5f | | -6(4-1)=12r | | x(2x-3)+x(3x-2)=(5x+6)(x-1) |

Equations solver categories