12x=15-x^2

Simple and best practice solution for 12x=15-x^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 12x=15-x^2 equation:


Simplifying
12x = 15 + -1x2

Solving
12x = 15 + -1x2

Solving for variable 'x'.

Reorder the terms:
-15 + 12x + x2 = 15 + -1x2 + -15 + x2

Reorder the terms:
-15 + 12x + x2 = 15 + -15 + -1x2 + x2

Combine like terms: 15 + -15 = 0
-15 + 12x + x2 = 0 + -1x2 + x2
-15 + 12x + x2 = -1x2 + x2

Combine like terms: -1x2 + x2 = 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 = 51
36 + 12x + x2 = 51

Factor a perfect square on the left side:
(x + 6)(x + 6) = 51

Calculate the square root of the right side: 7.141428429

Break this problem into two subproblems by setting 
(x + 6) equal to 7.141428429 and -7.141428429.

Subproblem 1

x + 6 = 7.141428429 Simplifying x + 6 = 7.141428429 Reorder the terms: 6 + x = 7.141428429 Solving 6 + x = 7.141428429 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 = 7.141428429 + -6 Combine like terms: 6 + -6 = 0 0 + x = 7.141428429 + -6 x = 7.141428429 + -6 Combine like terms: 7.141428429 + -6 = 1.141428429 x = 1.141428429 Simplifying x = 1.141428429

Subproblem 2

x + 6 = -7.141428429 Simplifying x + 6 = -7.141428429 Reorder the terms: 6 + x = -7.141428429 Solving 6 + x = -7.141428429 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 = -7.141428429 + -6 Combine like terms: 6 + -6 = 0 0 + x = -7.141428429 + -6 x = -7.141428429 + -6 Combine like terms: -7.141428429 + -6 = -13.141428429 x = -13.141428429 Simplifying x = -13.141428429

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.141428429, -13.141428429}

See similar equations:

| 4(u-2)-6(4u-7)= | | 9x=4x-45 | | 4x^2=25x | | 0.25(25x-15)=x+7 | | s-5=25.91 | | -0.45x+0.33=-0.66 | | 4(x-5)=3x-21 | | 2.567x=12.52696 | | x-16=110-x | | 9x-9=5+7x | | 2y^2+3y+9=0 | | 8x+4=7x-10 | | 5y+2(y-2)=8y-3(y-10) | | 3(3x-4)=12+x | | 0.8x-4=2.3x-25 | | 7+6x=4x-11 | | 12+2b=-8+b | | 5785^% | | ln(x+7)ln(x-5)=2lnx | | 3x^2-27x+30=0 | | 2v+11=5v-2 | | 5368=56+56 | | x^2-8x-51=-3 | | 7x^3+2x^2-6x-1=0 | | 26x+13=5(5x+4) | | -12=x+16 | | -17y+7(5+6y)= | | 15a^5+211a^3b^2+14ab^4=0 | | 3x+45=67 | | 4*8-x=3*9+x | | 7x^2y^2+23xy+1=0 | | 4.8-x=3.9+x |

Equations solver categories