x^2-3x=36

Simple and best practice solution for x^2-3x=36 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^2-3x=36 equation:


Simplifying
x2 + -3x = 36

Reorder the terms:
-3x + x2 = 36

Solving
-3x + x2 = 36

Solving for variable 'x'.

Reorder the terms:
-36 + -3x + x2 = 36 + -36

Combine like terms: 36 + -36 = 0
-36 + -3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '36' to each side of the equation.
-36 + -3x + 36 + x2 = 0 + 36

Reorder the terms:
-36 + 36 + -3x + x2 = 0 + 36

Combine like terms: -36 + 36 = 0
0 + -3x + x2 = 0 + 36
-3x + x2 = 0 + 36

Combine like terms: 0 + 36 = 36
-3x + x2 = 36

The x term is -3x.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3x + 2.25 + x2 = 36 + 2.25

Reorder the terms:
2.25 + -3x + x2 = 36 + 2.25

Combine like terms: 36 + 2.25 = 38.25
2.25 + -3x + x2 = 38.25

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 38.25

Calculate the square root of the right side: 6.184658438

Break this problem into two subproblems by setting 
(x + -1.5) equal to 6.184658438 and -6.184658438.

Subproblem 1

x + -1.5 = 6.184658438 Simplifying x + -1.5 = 6.184658438 Reorder the terms: -1.5 + x = 6.184658438 Solving -1.5 + x = 6.184658438 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = 6.184658438 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 6.184658438 + 1.5 x = 6.184658438 + 1.5 Combine like terms: 6.184658438 + 1.5 = 7.684658438 x = 7.684658438 Simplifying x = 7.684658438

Subproblem 2

x + -1.5 = -6.184658438 Simplifying x + -1.5 = -6.184658438 Reorder the terms: -1.5 + x = -6.184658438 Solving -1.5 + x = -6.184658438 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = -6.184658438 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -6.184658438 + 1.5 x = -6.184658438 + 1.5 Combine like terms: -6.184658438 + 1.5 = -4.684658438 x = -4.684658438 Simplifying x = -4.684658438

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.684658438, -4.684658438}

See similar equations:

| 2x^1/2-18=16 | | x/30=4/5 | | 0.7w+16+4w=22.28 | | 10m-50=10x(11-5) | | 2=-42-12 | | (18-2x)(18-2x)-4*(18-2x)*x=0 | | -3(5p-1)-2(1+6p)=1-6p-4p | | 30.7th=-73.8 | | 12-(5-2x)+8x=6-2(x+1) | | 3b+b^2=0 | | 14c^3-21c= | | (18-x)(18-x)-2*(18-x)*x=0 | | 4y-36/9-y | | 2(x+3)=5(x-1)-7(x-3)+2 | | .6x+.25x=22 | | -238=-7(6b+4) | | 10=2(7x+3)+2 | | 9t=3t-4t | | k-3/7=-3 | | 4x=(5x-30) | | 6-.2y=7 | | x^2+300x-21600=0 | | (5-3x)-(-4x+6)=(8x+11)-3(x-2) | | 8(x+6)+23=23 | | 30a^2=12a+96 | | 12+2=-42 | | 5(x-2)+4x=3(2x-1) | | 2(s-9)=s+2 | | 6x+y=28 | | 4/2-4i | | 1/3b+3=13 | | 8(3x-4)=4x+7 |

Equations solver categories