18x+x^2=115.2

Simple and best practice solution for 18x+x^2=115.2 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 18x+x^2=115.2 equation:


Simplifying
18x + x2 = 115.2

Solving
18x + x2 = 115.2

Solving for variable 'x'.

Reorder the terms:
-115.2 + 18x + x2 = 115.2 + -115.2

Combine like terms: 115.2 + -115.2 = 0.0
-115.2 + 18x + x2 = 0.0

Begin completing the square.

Move the constant term to the right:

Add '115.2' to each side of the equation.
-115.2 + 18x + 115.2 + x2 = 0.0 + 115.2

Reorder the terms:
-115.2 + 115.2 + 18x + x2 = 0.0 + 115.2

Combine like terms: -115.2 + 115.2 = 0.0
0.0 + 18x + x2 = 0.0 + 115.2
18x + x2 = 0.0 + 115.2

Combine like terms: 0.0 + 115.2 = 115.2
18x + x2 = 115.2

The x term is 18x.  Take half its coefficient (9).
Square it (81) and add it to both sides.

Add '81' to each side of the equation.
18x + 81 + x2 = 115.2 + 81

Reorder the terms:
81 + 18x + x2 = 115.2 + 81

Combine like terms: 115.2 + 81 = 196.2
81 + 18x + x2 = 196.2

Factor a perfect square on the left side:
(x + 9)(x + 9) = 196.2

Calculate the square root of the right side: 14.007141036

Break this problem into two subproblems by setting 
(x + 9) equal to 14.007141036 and -14.007141036.

Subproblem 1

x + 9 = 14.007141036 Simplifying x + 9 = 14.007141036 Reorder the terms: 9 + x = 14.007141036 Solving 9 + x = 14.007141036 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + x = 14.007141036 + -9 Combine like terms: 9 + -9 = 0 0 + x = 14.007141036 + -9 x = 14.007141036 + -9 Combine like terms: 14.007141036 + -9 = 5.007141036 x = 5.007141036 Simplifying x = 5.007141036

Subproblem 2

x + 9 = -14.007141036 Simplifying x + 9 = -14.007141036 Reorder the terms: 9 + x = -14.007141036 Solving 9 + x = -14.007141036 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + x = -14.007141036 + -9 Combine like terms: 9 + -9 = 0 0 + x = -14.007141036 + -9 x = -14.007141036 + -9 Combine like terms: -14.007141036 + -9 = -23.007141036 x = -23.007141036 Simplifying x = -23.007141036

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.007141036, -23.007141036}

See similar equations:

| X+x=y | | 4y-6=5y-2y | | (759x^2)-5=1 | | 15x+5y=23 | | 3x^4+10x^3+21x^2+24x-16=0 | | (x/2-125)/125 | | 3x+12=3+12 | | 3x^4+10x^3+21x^2+24s-16=0 | | 0.83=18/x | | -7.5+3= | | y=-15x+4500 | | 27x+9y=39 | | 22=8t+7-3t | | 3x^2+15-33=0 | | -5x+9=-3+10x | | 3x+3/4+x+3/5=8 | | .7X^2-28X=13014.30 | | 12x+15y=745 | | -3x+x-5=-2(x+2)-1 | | 7.83=3900x+1000/3x^2+100 | | x-8/7+8/7=-x/3 | | 7.83=3900x1000/3x^2+100 | | -Y^2+12Y+14=0 | | 5(x-3)+2(x+5)=3x-1 | | 24/Y/2Y^2+12Y=0 | | 64x^12y^12/16x^6y^24 | | 0.675s=-4 | | y=12-13x | | 2n-1/3=n/2+5-n | | -2/3s=-4 | | 5g+2g=49 | | 2[x-(2x+9)+8]=2(x+1) |

Equations solver categories