x^2-18=3x-x^2

Simple and best practice solution for x^2-18=3x-x^2 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^2-18=3x-x^2 equation:


Simplifying
x2 + -18 = 3x + -1x2

Reorder the terms:
-18 + x2 = 3x + -1x2

Solving
-18 + x2 = 3x + -1x2

Solving for variable 'x'.

Reorder the terms:
-18 + -3x + x2 + x2 = 3x + -1x2 + -3x + x2

Combine like terms: x2 + x2 = 2x2
-18 + -3x + 2x2 = 3x + -1x2 + -3x + x2

Reorder the terms:
-18 + -3x + 2x2 = 3x + -3x + -1x2 + x2

Combine like terms: 3x + -3x = 0
-18 + -3x + 2x2 = 0 + -1x2 + x2
-18 + -3x + 2x2 = -1x2 + x2

Combine like terms: -1x2 + x2 = 0
-18 + -3x + 2x2 = 0

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

Divide each side by '2'.
-9 + -1.5x + x2 = 0

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + -1.5x + 9 + x2 = 0 + 9

Reorder the terms:
-9 + 9 + -1.5x + x2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -1.5x + x2 = 0 + 9
-1.5x + x2 = 0 + 9

Combine like terms: 0 + 9 = 9
-1.5x + x2 = 9

The x term is -1.5x.  Take half its coefficient (-0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
-1.5x + 0.5625 + x2 = 9 + 0.5625

Reorder the terms:
0.5625 + -1.5x + x2 = 9 + 0.5625

Combine like terms: 9 + 0.5625 = 9.5625
0.5625 + -1.5x + x2 = 9.5625

Factor a perfect square on the left side:
(x + -0.75)(x + -0.75) = 9.5625

Calculate the square root of the right side: 3.092329219

Break this problem into two subproblems by setting 
(x + -0.75) equal to 3.092329219 and -3.092329219.

Subproblem 1

x + -0.75 = 3.092329219 Simplifying x + -0.75 = 3.092329219 Reorder the terms: -0.75 + x = 3.092329219 Solving -0.75 + x = 3.092329219 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + x = 3.092329219 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = 3.092329219 + 0.75 x = 3.092329219 + 0.75 Combine like terms: 3.092329219 + 0.75 = 3.842329219 x = 3.842329219 Simplifying x = 3.842329219

Subproblem 2

x + -0.75 = -3.092329219 Simplifying x + -0.75 = -3.092329219 Reorder the terms: -0.75 + x = -3.092329219 Solving -0.75 + x = -3.092329219 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + x = -3.092329219 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = -3.092329219 + 0.75 x = -3.092329219 + 0.75 Combine like terms: -3.092329219 + 0.75 = -2.342329219 x = -2.342329219 Simplifying x = -2.342329219

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.842329219, -2.342329219}

See similar equations:

| 3(y-4)=6 | | 3X^2-14X+7=0 | | 4x^2=29 | | -5(3x-2b)+10=4+3ax | | (n-10)*10=50 | | (n-3)*3=21 | | 1300-140x=1060-80x | | xy-3x+5y=0 | | 4x(-7)=5+(x+7) | | 2-0.4x+x=2.5 | | 12x^2-10x=1 | | 0.002*0.003= | | 5v^7x^9*2v*2x^3= | | 1-(m-6)=2 | | m-6=2(m-7) | | 8(p+6)-5p= | | 2m-3(1-m)=22 | | 2x+7=6x-8 | | 5v^7x^8*2v*2x^3= | | -(2y-5)+11= | | -(2y-5y)+11= | | 4x-x+9x= | | y=-1300(4)+10400 | | -3-7(2x+2)=4(-1-x) | | y=160(5)+4100 | | 3+4(2x-1)=3(x+5)-2 | | 2x=5x-4 | | -2(3+x)+2x=6(x+2) | | 6.45+.08x=35.25 | | .06(260)+7.95=y | | 5(3-2x)=-(4x+1) | | 3x^2+18x-6=0 |

Equations solver categories