x^2+16x=18

Simple and best practice solution for x^2+16x=18 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+16x=18 equation:


Simplifying
x2 + 16x = 18

Reorder the terms:
16x + x2 = 18

Solving
16x + x2 = 18

Solving for variable 'x'.

Reorder the terms:
-18 + 16x + x2 = 18 + -18

Combine like terms: 18 + -18 = 0
-18 + 16x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '18' to each side of the equation.
-18 + 16x + 18 + x2 = 0 + 18

Reorder the terms:
-18 + 18 + 16x + x2 = 0 + 18

Combine like terms: -18 + 18 = 0
0 + 16x + x2 = 0 + 18
16x + x2 = 0 + 18

Combine like terms: 0 + 18 = 18
16x + x2 = 18

The x term is 16x.  Take half its coefficient (8).
Square it (64) and add it to both sides.

Add '64' to each side of the equation.
16x + 64 + x2 = 18 + 64

Reorder the terms:
64 + 16x + x2 = 18 + 64

Combine like terms: 18 + 64 = 82
64 + 16x + x2 = 82

Factor a perfect square on the left side:
(x + 8)(x + 8) = 82

Calculate the square root of the right side: 9.055385138

Break this problem into two subproblems by setting 
(x + 8) equal to 9.055385138 and -9.055385138.

Subproblem 1

x + 8 = 9.055385138 Simplifying x + 8 = 9.055385138 Reorder the terms: 8 + x = 9.055385138 Solving 8 + x = 9.055385138 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + x = 9.055385138 + -8 Combine like terms: 8 + -8 = 0 0 + x = 9.055385138 + -8 x = 9.055385138 + -8 Combine like terms: 9.055385138 + -8 = 1.055385138 x = 1.055385138 Simplifying x = 1.055385138

Subproblem 2

x + 8 = -9.055385138 Simplifying x + 8 = -9.055385138 Reorder the terms: 8 + x = -9.055385138 Solving 8 + x = -9.055385138 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + x = -9.055385138 + -8 Combine like terms: 8 + -8 = 0 0 + x = -9.055385138 + -8 x = -9.055385138 + -8 Combine like terms: -9.055385138 + -8 = -17.055385138 x = -17.055385138 Simplifying x = -17.055385138

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.055385138, -17.055385138}

See similar equations:

| 32-7x=-6(x+3) | | 10-(-7/5) | | -1/9c=8 | | 3y=.5x-4 | | 42(x-5)=0 | | X=-9+5y | | 1=3+-y | | 7(-1/5) | | 1/5=5y-10 | | 5=j-61/6 | | -(4x-7)=13 | | f(x)=9x^6+20 | | -p+8p=14 | | 10(r+49)=-10 | | 4x-9=6x-3x | | 5i/3-5i | | 45x-5+16x+2=180 | | -3+1=X+9 | | 8=3v-7 | | 40=x+3 | | f(3)=21x+14 | | 8z+2z=9z+2 | | 3+5=30+2x | | 3w+12=51 | | -2n-n=24 | | -25z+135z=10z+1 | | 12x^2-108x+216=0 | | 0=2+-b | | 3x+5=85+60 | | 3(y+2)+4=5(y-5)+y | | -v=8v | | 4(z-2)=3z |

Equations solver categories