x^2+5x=42

Simple and best practice solution for x^2+5x=42 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+5x=42 equation:


Simplifying
x2 + 5x = 42

Reorder the terms:
5x + x2 = 42

Solving
5x + x2 = 42

Solving for variable 'x'.

Reorder the terms:
-42 + 5x + x2 = 42 + -42

Combine like terms: 42 + -42 = 0
-42 + 5x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '42' to each side of the equation.
-42 + 5x + 42 + x2 = 0 + 42

Reorder the terms:
-42 + 42 + 5x + x2 = 0 + 42

Combine like terms: -42 + 42 = 0
0 + 5x + x2 = 0 + 42
5x + x2 = 0 + 42

Combine like terms: 0 + 42 = 42
5x + x2 = 42

The x term is 5x.  Take half its coefficient (2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
5x + 6.25 + x2 = 42 + 6.25

Reorder the terms:
6.25 + 5x + x2 = 42 + 6.25

Combine like terms: 42 + 6.25 = 48.25
6.25 + 5x + x2 = 48.25

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 48.25

Calculate the square root of the right side: 6.946221995

Break this problem into two subproblems by setting 
(x + 2.5) equal to 6.946221995 and -6.946221995.

Subproblem 1

x + 2.5 = 6.946221995 Simplifying x + 2.5 = 6.946221995 Reorder the terms: 2.5 + x = 6.946221995 Solving 2.5 + x = 6.946221995 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = 6.946221995 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = 6.946221995 + -2.5 x = 6.946221995 + -2.5 Combine like terms: 6.946221995 + -2.5 = 4.446221995 x = 4.446221995 Simplifying x = 4.446221995

Subproblem 2

x + 2.5 = -6.946221995 Simplifying x + 2.5 = -6.946221995 Reorder the terms: 2.5 + x = -6.946221995 Solving 2.5 + x = -6.946221995 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = -6.946221995 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = -6.946221995 + -2.5 x = -6.946221995 + -2.5 Combine like terms: -6.946221995 + -2.5 = -9.446221995 x = -9.446221995 Simplifying x = -9.446221995

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.446221995, -9.446221995}

See similar equations:

| 2[5-3(x+1)]=25+x | | x^2+y^2+2x-2y=0 | | x^2+y^2+2x-2y=11 | | -5(x+3)=7x+5 | | 2.899x=2.33x+100 | | 36m*60m= | | .5x=100+.1x | | 1/x-6/x^2=2/x^2 | | 1/2-6/x^2=2/x^2 | | 14=3x^2-19x | | x^4-2x^2-x=0 | | -16(x-4)=832 | | kx^2+2x+k=0 | | 8x-8=-16x | | 7+y=5y+39 | | -2x-5/94/3x-6 | | 1/3x-3/84 | | 5p-10=2p-25 | | 6h+h=35 | | 5/2(x-6)=5/4x-7/12 | | (2w+5x)(6w-7x-6)= | | 3r+7+5r=23 | | 8=3x-6 | | 15x-1=13x-5 | | X^2+700X=18000 | | -6x-40=-x | | 2/3(x-1/4)=7/6 | | 1/8(8x-7)=-3/4-9/4 | | 1/8(8x-7)=-3/1-9/4 | | -3x-123+5x=28 | | 2/7(x-1/4)=7/6 | | 13x=21+10x |

Equations solver categories