s^2+18s-12=0

Simple and best practice solution for s^2+18s-12=0 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 s^2+18s-12=0 equation:


Simplifying
s2 + 18s + -12 = 0

Reorder the terms:
-12 + 18s + s2 = 0

Solving
-12 + 18s + s2 = 0

Solving for variable 's'.

Begin completing the square.

Move the constant term to the right:

Add '12' to each side of the equation.
-12 + 18s + 12 + s2 = 0 + 12

Reorder the terms:
-12 + 12 + 18s + s2 = 0 + 12

Combine like terms: -12 + 12 = 0
0 + 18s + s2 = 0 + 12
18s + s2 = 0 + 12

Combine like terms: 0 + 12 = 12
18s + s2 = 12

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

Add '81' to each side of the equation.
18s + 81 + s2 = 12 + 81

Reorder the terms:
81 + 18s + s2 = 12 + 81

Combine like terms: 12 + 81 = 93
81 + 18s + s2 = 93

Factor a perfect square on the left side:
(s + 9)(s + 9) = 93

Calculate the square root of the right side: 9.643650761

Break this problem into two subproblems by setting 
(s + 9) equal to 9.643650761 and -9.643650761.

Subproblem 1

s + 9 = 9.643650761 Simplifying s + 9 = 9.643650761 Reorder the terms: 9 + s = 9.643650761 Solving 9 + s = 9.643650761 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + s = 9.643650761 + -9 Combine like terms: 9 + -9 = 0 0 + s = 9.643650761 + -9 s = 9.643650761 + -9 Combine like terms: 9.643650761 + -9 = 0.643650761 s = 0.643650761 Simplifying s = 0.643650761

Subproblem 2

s + 9 = -9.643650761 Simplifying s + 9 = -9.643650761 Reorder the terms: 9 + s = -9.643650761 Solving 9 + s = -9.643650761 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + s = -9.643650761 + -9 Combine like terms: 9 + -9 = 0 0 + s = -9.643650761 + -9 s = -9.643650761 + -9 Combine like terms: -9.643650761 + -9 = -18.643650761 s = -18.643650761 Simplifying s = -18.643650761

Solution

The solution to the problem is based on the solutions from the subproblems. s = {0.643650761, -18.643650761}

See similar equations:

| 12/x=36/16 | | 5(f-3)=0 | | 4/8=6/12 | | 8(-m-4n)= | | 3x+14=-63-6x | | F(x)=3x^3+12x^2+3x-18 | | 1.5=4.1y+1.4 | | 1.5=4.1y+7z | | 2ln(x-4)=4 | | 3x-2y+z=72 | | 1.5x=4.1y+7z | | 6x+3(x-0.789)=4(2x+0.3912) | | b^2-60=4b | | b*b-60=4b | | 24q^3r+20q^4r^6=4q^3r | | 225c^2-121= | | -18a=0 | | 111-(7x+16)=7(x+5)+x | | -2(5+2)=3-9x | | 9ay/2y^4*4y/3a | | 15,3/170,3 | | 108a^2-245= | | 0.3-1.7=1.9 | | 16=(13x-7) | | 12-2r/80-4r=0.25 | | Y-4=-2(X-0) | | Y-2=4(X-(-1)) | | -4z=0 | | 4x-6=3x-9 | | 5x^4+60x^3+135x^2-378x+162=0 | | (2x^9/y)^-2 | | 7x^2-33x^4-4x^2+3x+52=0 |

Equations solver categories