x^2-3x=13

Simple and best practice solution for x^2-3x=13 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=13 equation:


Simplifying
x2 + -3x = 13

Reorder the terms:
-3x + x2 = 13

Solving
-3x + x2 = 13

Solving for variable 'x'.

Reorder the terms:
-13 + -3x + x2 = 13 + -13

Combine like terms: 13 + -13 = 0
-13 + -3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '13' to each side of the equation.
-13 + -3x + 13 + x2 = 0 + 13

Reorder the terms:
-13 + 13 + -3x + x2 = 0 + 13

Combine like terms: -13 + 13 = 0
0 + -3x + x2 = 0 + 13
-3x + x2 = 0 + 13

Combine like terms: 0 + 13 = 13
-3x + x2 = 13

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 = 13 + 2.25

Reorder the terms:
2.25 + -3x + x2 = 13 + 2.25

Combine like terms: 13 + 2.25 = 15.25
2.25 + -3x + x2 = 15.25

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 15.25

Calculate the square root of the right side: 3.905124838

Break this problem into two subproblems by setting 
(x + -1.5) equal to 3.905124838 and -3.905124838.

Subproblem 1

x + -1.5 = 3.905124838 Simplifying x + -1.5 = 3.905124838 Reorder the terms: -1.5 + x = 3.905124838 Solving -1.5 + x = 3.905124838 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 = 3.905124838 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 3.905124838 + 1.5 x = 3.905124838 + 1.5 Combine like terms: 3.905124838 + 1.5 = 5.405124838 x = 5.405124838 Simplifying x = 5.405124838

Subproblem 2

x + -1.5 = -3.905124838 Simplifying x + -1.5 = -3.905124838 Reorder the terms: -1.5 + x = -3.905124838 Solving -1.5 + x = -3.905124838 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 = -3.905124838 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -3.905124838 + 1.5 x = -3.905124838 + 1.5 Combine like terms: -3.905124838 + 1.5 = -2.405124838 x = -2.405124838 Simplifying x = -2.405124838

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.405124838, -2.405124838}

See similar equations:

| 2c(3b-4)-3b(-5+2c)= | | 6w^2+11w+3=0 | | 10-10x=1333-31x | | 1/4x2/4 | | 2k^2-7k-15=0 | | 5x+3=4x-4 | | z^2-z+5=0 | | 4(2-4x)=16 | | 3x=22x | | 3ix-5+3i=(3-1)y+1 | | 7m-2m= | | 53-2x=25x+20 | | 6x+129=16x-11 | | 8-10=2x | | 4u^2+23u+28=0 | | 10x+2=8x+14 | | -2x+4=-4x+2 | | (2x^2y-3y^4)dx+(3x^3+2xy^3)dy=0 | | (2x^2y-3y^4)dx+(3x^3-2xy^3)dy=0 | | 4x+2=-2x+7 | | -3x+7=4x-12 | | (13-6)*(2+5)= | | 45+105+(4x-15)+5x=360 | | 5x+5=2x+9 | | 24=4(2-2x) | | 10x-8=8x+7 | | 4y+12=2y-10 | | 6(7x+1)=43x | | 7x-7=3x+10 | | x^2-((2/3)*x)-(27/16) | | x^2-(2/3x)-(27/16)=0 | | 4U^2-19u+15=0 |

Equations solver categories