x^2-9=6x

Simple and best practice solution for x^2-9=6x 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^2-9=6x equation:


Simplifying
x2 + -9 = 6x

Reorder the terms:
-9 + x2 = 6x

Solving
-9 + x2 = 6x

Solving for variable 'x'.

Reorder the terms:
-9 + -6x + x2 = 6x + -6x

Combine like terms: 6x + -6x = 0
-9 + -6x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + -6x + 9 + x2 = 0 + 9

Reorder the terms:
-9 + 9 + -6x + x2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -6x + x2 = 0 + 9
-6x + x2 = 0 + 9

Combine like terms: 0 + 9 = 9
-6x + x2 = 9

The x term is -6x.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6x + 9 + x2 = 9 + 9

Reorder the terms:
9 + -6x + x2 = 9 + 9

Combine like terms: 9 + 9 = 18
9 + -6x + x2 = 18

Factor a perfect square on the left side:
(x + -3)(x + -3) = 18

Calculate the square root of the right side: 4.242640687

Break this problem into two subproblems by setting 
(x + -3) equal to 4.242640687 and -4.242640687.

Subproblem 1

x + -3 = 4.242640687 Simplifying x + -3 = 4.242640687 Reorder the terms: -3 + x = 4.242640687 Solving -3 + x = 4.242640687 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = 4.242640687 + 3 Combine like terms: -3 + 3 = 0 0 + x = 4.242640687 + 3 x = 4.242640687 + 3 Combine like terms: 4.242640687 + 3 = 7.242640687 x = 7.242640687 Simplifying x = 7.242640687

Subproblem 2

x + -3 = -4.242640687 Simplifying x + -3 = -4.242640687 Reorder the terms: -3 + x = -4.242640687 Solving -3 + x = -4.242640687 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = -4.242640687 + 3 Combine like terms: -3 + 3 = 0 0 + x = -4.242640687 + 3 x = -4.242640687 + 3 Combine like terms: -4.242640687 + 3 = -1.242640687 x = -1.242640687 Simplifying x = -1.242640687

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.242640687, -1.242640687}

See similar equations:

| 5z=-4.8 | | -4=2w | | 5p-16=17p+31 | | 6=-6x | | y=-(-4)-6 | | 15x-5+(2x-2)=3(3x-5) | | 4k/5+1=9/10 | | -8z+4z=12-16 | | (3+w)w=40 | | -8z-4z=12-16 | | y=ln(1-x) | | 27x^2-8=0 | | 3y-8y=4 | | 7x-(-13+3x)12=13 | | 12x+48=8x | | 2x^2+20x-8=0 | | 0.06+0.08(x+100)=15 | | 3x+(3+2x)18=-24 | | -10=-.5+d | | .667(5-a)=2 | | 5a+25ab= | | b^4-b^3= | | 4(3x-1)=7(3-2x)+5 | | 25x^4-25y^4= | | 3x^2-6x-45=o | | 2n-9=3 | | a(x-a)=b(x-b) | | -3x^2+x+5=0 | | a(x*a)=b(x-b) | | x+37=-112 | | 2=11z-5z^2 | | x+24=52 |

Equations solver categories