x^2-4x=31

Simple and best practice solution for x^2-4x=31 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^2-4x=31 equation:


Simplifying
x2 + -4x = 31

Reorder the terms:
-4x + x2 = 31

Solving
-4x + x2 = 31

Solving for variable 'x'.

Reorder the terms:
-31 + -4x + x2 = 31 + -31

Combine like terms: 31 + -31 = 0
-31 + -4x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '31' to each side of the equation.
-31 + -4x + 31 + x2 = 0 + 31

Reorder the terms:
-31 + 31 + -4x + x2 = 0 + 31

Combine like terms: -31 + 31 = 0
0 + -4x + x2 = 0 + 31
-4x + x2 = 0 + 31

Combine like terms: 0 + 31 = 31
-4x + x2 = 31

The x term is -4x.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4x + 4 + x2 = 31 + 4

Reorder the terms:
4 + -4x + x2 = 31 + 4

Combine like terms: 31 + 4 = 35
4 + -4x + x2 = 35

Factor a perfect square on the left side:
(x + -2)(x + -2) = 35

Calculate the square root of the right side: 5.916079783

Break this problem into two subproblems by setting 
(x + -2) equal to 5.916079783 and -5.916079783.

Subproblem 1

x + -2 = 5.916079783 Simplifying x + -2 = 5.916079783 Reorder the terms: -2 + x = 5.916079783 Solving -2 + x = 5.916079783 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = 5.916079783 + 2 Combine like terms: -2 + 2 = 0 0 + x = 5.916079783 + 2 x = 5.916079783 + 2 Combine like terms: 5.916079783 + 2 = 7.916079783 x = 7.916079783 Simplifying x = 7.916079783

Subproblem 2

x + -2 = -5.916079783 Simplifying x + -2 = -5.916079783 Reorder the terms: -2 + x = -5.916079783 Solving -2 + x = -5.916079783 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = -5.916079783 + 2 Combine like terms: -2 + 2 = 0 0 + x = -5.916079783 + 2 x = -5.916079783 + 2 Combine like terms: -5.916079783 + 2 = -3.916079783 x = -3.916079783 Simplifying x = -3.916079783

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.916079783, -3.916079783}

See similar equations:

| (4x+1)(x^3-3x^2+x-3)= | | (7x+1)(12x-9)-(-x+2)=0 | | P=2a+3bfora | | -7+9y+6-7y= | | 3(m-3)+5m+4=5m-8 | | (-2x+2y)-(3x-3y)= | | 4p+6-3= | | 12p+5p= | | f(x)=1/4*-5 | | (5x-4y)(4x-3y)= | | 38-8r= | | 6(r+3)+2(r+5)+10= | | 6(r+3)-2(r+5)+10= | | (A+3)-x(a+3)= | | 3x-1y=-15 | | 2a(xy-7)-10(xy-7)-z(xy-7)= | | 3x+1+x=-x-24 | | 2-x=x-8 | | 32+3z=5 | | 8x^4-10x^3+6x= | | 4x+3(x-2)=5x+16 | | F(X)=-2(3*3)-4 | | 4b(5a-6c)-d(5a-6c)= | | n^2=12-n | | 5x(x-6)+3(x-6)= | | 2x(x-5)-9(x-5)= | | 7x(x-7)+2(x-7)= | | 5x(x-7)-4(x-7)= | | 21=a+8 | | 15-(x+9)=8x-3 | | 105/14 | | 8x^7y^5-6x^5y^5-2x^5y^4= |

Equations solver categories