400x-5x^2-6=

Simple and best practice solution for 400x-5x^2-6= 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 400x-5x^2-6= equation:


Simplifying
400x + -5x2 + -6 = 0

Reorder the terms:
-6 + 400x + -5x2 = 0

Solving
-6 + 400x + -5x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-5 the coefficient of the squared term: 

Divide each side by '-5'.
1.2 + -80x + x2 = 0

Move the constant term to the right:

Add '-1.2' to each side of the equation.
1.2 + -80x + -1.2 + x2 = 0 + -1.2

Reorder the terms:
1.2 + -1.2 + -80x + x2 = 0 + -1.2

Combine like terms: 1.2 + -1.2 = 0.0
0.0 + -80x + x2 = 0 + -1.2
-80x + x2 = 0 + -1.2

Combine like terms: 0 + -1.2 = -1.2
-80x + x2 = -1.2

The x term is -80x.  Take half its coefficient (-40).
Square it (1600) and add it to both sides.

Add '1600' to each side of the equation.
-80x + 1600 + x2 = -1.2 + 1600

Reorder the terms:
1600 + -80x + x2 = -1.2 + 1600

Combine like terms: -1.2 + 1600 = 1598.8
1600 + -80x + x2 = 1598.8

Factor a perfect square on the left side:
(x + -40)(x + -40) = 1598.8

Calculate the square root of the right side: 39.984997186

Break this problem into two subproblems by setting 
(x + -40) equal to 39.984997186 and -39.984997186.

Subproblem 1

x + -40 = 39.984997186 Simplifying x + -40 = 39.984997186 Reorder the terms: -40 + x = 39.984997186 Solving -40 + x = 39.984997186 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '40' to each side of the equation. -40 + 40 + x = 39.984997186 + 40 Combine like terms: -40 + 40 = 0 0 + x = 39.984997186 + 40 x = 39.984997186 + 40 Combine like terms: 39.984997186 + 40 = 79.984997186 x = 79.984997186 Simplifying x = 79.984997186

Subproblem 2

x + -40 = -39.984997186 Simplifying x + -40 = -39.984997186 Reorder the terms: -40 + x = -39.984997186 Solving -40 + x = -39.984997186 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '40' to each side of the equation. -40 + 40 + x = -39.984997186 + 40 Combine like terms: -40 + 40 = 0 0 + x = -39.984997186 + 40 x = -39.984997186 + 40 Combine like terms: -39.984997186 + 40 = 0.015002814 x = 0.015002814 Simplifying x = 0.015002814

Solution

The solution to the problem is based on the solutions from the subproblems. x = {79.984997186, 0.015002814}

See similar equations:

| 6x+4-2x=4x+8 | | 17.5+3x=-6.5(3x-6) | | 2(x-3)+5(x+1)=-3(-2x+5)-6 | | -2x-18=-3x+42 | | 6b^2-7b-3=0 | | 4x^2+140x+1200=2000 | | 9x-9=25 | | 1/3(4x-25)=3x | | 2m^2-5mn+3n^2=0 | | 4x+9=2x+(3x-12) | | 2p+9=12+2p | | 22m^2-41m+12=0 | | 35x+20y= | | dx/dt=(x-1)*(1-2x) | | X+2x+8=48 | | 3y-12=-63 | | x/8-14=3 | | 10x-89=72+3x | | 8a-4(-51-2)=12a | | 4e^(1/10)x=60 | | 17849=27x | | 6x+1/12-x-13/9=5x-3/2+x/3 | | -16t^2+64t^2=48 | | 91n^2+n-2=0 | | 5(x-9)+26=-3(-2x+5)-6 | | -16t+64t=48 | | Q(t)=0.85t | | 5n^2+32n+35=0 | | ax+5x-14=0 | | 3-(b+5)-2b+7=b-11 | | 40x+100=y | | 9x-3=180 |

Equations solver categories