x^2-12x+36=21

Simple and best practice solution for x^2-12x+36=21 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^2-12x+36=21 equation:


Simplifying
x2 + -12x + 36 = 21

Reorder the terms:
36 + -12x + x2 = 21

Solving
36 + -12x + x2 = 21

Solving for variable 'x'.

Reorder the terms:
36 + -21 + -12x + x2 = 21 + -21

Combine like terms: 36 + -21 = 15
15 + -12x + x2 = 21 + -21

Combine like terms: 21 + -21 = 0
15 + -12x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-15' to each side of the equation.
15 + -12x + -15 + x2 = 0 + -15

Reorder the terms:
15 + -15 + -12x + x2 = 0 + -15

Combine like terms: 15 + -15 = 0
0 + -12x + x2 = 0 + -15
-12x + x2 = 0 + -15

Combine like terms: 0 + -15 = -15
-12x + x2 = -15

The x term is -12x.  Take half its coefficient (-6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
-12x + 36 + x2 = -15 + 36

Reorder the terms:
36 + -12x + x2 = -15 + 36

Combine like terms: -15 + 36 = 21
36 + -12x + x2 = 21

Factor a perfect square on the left side:
(x + -6)(x + -6) = 21

Calculate the square root of the right side: 4.582575695

Break this problem into two subproblems by setting 
(x + -6) equal to 4.582575695 and -4.582575695.

Subproblem 1

x + -6 = 4.582575695 Simplifying x + -6 = 4.582575695 Reorder the terms: -6 + x = 4.582575695 Solving -6 + x = 4.582575695 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + x = 4.582575695 + 6 Combine like terms: -6 + 6 = 0 0 + x = 4.582575695 + 6 x = 4.582575695 + 6 Combine like terms: 4.582575695 + 6 = 10.582575695 x = 10.582575695 Simplifying x = 10.582575695

Subproblem 2

x + -6 = -4.582575695 Simplifying x + -6 = -4.582575695 Reorder the terms: -6 + x = -4.582575695 Solving -6 + x = -4.582575695 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + x = -4.582575695 + 6 Combine like terms: -6 + 6 = 0 0 + x = -4.582575695 + 6 x = -4.582575695 + 6 Combine like terms: -4.582575695 + 6 = 1.417424305 x = 1.417424305 Simplifying x = 1.417424305

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.582575695, 1.417424305}

See similar equations:

| 7+4x+2x=-23 | | 8(v+3)-2v=2(3v+1)-5 | | 7-5/9y=9 | | -6(x+3)+4x+5=5x+10 | | 4(6/8)*5(4/3) | | f(x)=6+2ln(3) | | 4+6/8*5+4/3 | | f(x)=6+2ln(x) | | 46/8*54/3 | | f(3)=6+2ln(3) | | (7a-3b)(7a+3b)= | | 5x-8x-3(x-2)=-6 | | 6(1/4y-2)-(1/3y+1)=2(3/4-6y) | | (2x+6)=8 | | 4x-2(5+x)=6 | | 7b+3-4b=3+3(b+4) | | 375=(25)(7)+b | | -(8-9a)-(5+8a)-9=-(4-5a)+(-a)+3 | | 17z+-20z+2z=13 | | 7(t+8.5)-5t+4=2t+63.5 | | 20x+10=210 | | 1/2+3y=6y-1/4 | | 4x+y-2y=6+x+5 | | -[4x-(2x+5)]=-8-[4(2x-5)-4x] | | -(4x+3)=21 | | b-26/17=29 | | p=2m+2u | | 3/4(12x-6) | | 5+r/-3=12 | | 2x^3+8xy-4=0 | | r=(6000)(0.50)(3.50) | | -24=2s |

Equations solver categories