X^2+7=7X+3

Simple and best practice solution for X^2+7=7X+3 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+7=7X+3 equation:


Simplifying
X2 + 7 = 7X + 3

Reorder the terms:
7 + X2 = 7X + 3

Reorder the terms:
7 + X2 = 3 + 7X

Solving
7 + X2 = 3 + 7X

Solving for variable 'X'.

Reorder the terms:
7 + -3 + -7X + X2 = 3 + 7X + -3 + -7X

Combine like terms: 7 + -3 = 4
4 + -7X + X2 = 3 + 7X + -3 + -7X

Reorder the terms:
4 + -7X + X2 = 3 + -3 + 7X + -7X

Combine like terms: 3 + -3 = 0
4 + -7X + X2 = 0 + 7X + -7X
4 + -7X + X2 = 7X + -7X

Combine like terms: 7X + -7X = 0
4 + -7X + X2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-4' to each side of the equation.
4 + -7X + -4 + X2 = 0 + -4

Reorder the terms:
4 + -4 + -7X + X2 = 0 + -4

Combine like terms: 4 + -4 = 0
0 + -7X + X2 = 0 + -4
-7X + X2 = 0 + -4

Combine like terms: 0 + -4 = -4
-7X + X2 = -4

The X term is -7X.  Take half its coefficient (-3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
-7X + 12.25 + X2 = -4 + 12.25

Reorder the terms:
12.25 + -7X + X2 = -4 + 12.25

Combine like terms: -4 + 12.25 = 8.25
12.25 + -7X + X2 = 8.25

Factor a perfect square on the left side:
(X + -3.5)(X + -3.5) = 8.25

Calculate the square root of the right side: 2.872281323

Break this problem into two subproblems by setting 
(X + -3.5) equal to 2.872281323 and -2.872281323.

Subproblem 1

X + -3.5 = 2.872281323 Simplifying X + -3.5 = 2.872281323 Reorder the terms: -3.5 + X = 2.872281323 Solving -3.5 + X = 2.872281323 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + X = 2.872281323 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + X = 2.872281323 + 3.5 X = 2.872281323 + 3.5 Combine like terms: 2.872281323 + 3.5 = 6.372281323 X = 6.372281323 Simplifying X = 6.372281323

Subproblem 2

X + -3.5 = -2.872281323 Simplifying X + -3.5 = -2.872281323 Reorder the terms: -3.5 + X = -2.872281323 Solving -3.5 + X = -2.872281323 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + X = -2.872281323 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + X = -2.872281323 + 3.5 X = -2.872281323 + 3.5 Combine like terms: -2.872281323 + 3.5 = 0.627718677 X = 0.627718677 Simplifying X = 0.627718677

Solution

The solution to the problem is based on the solutions from the subproblems. X = {6.372281323, 0.627718677}

See similar equations:

| 1.2q-1.9-1.3q=-1.1q-3.6 | | u^2-4u=25 | | -3.7u=7.75 | | A=2x^2+15x+18 | | -3x^2-24x+17=-40 | | -5x^2-20x+35=30 | | 2x^2-14x+10=26 | | y=-x+30 | | -8(4-x)+2x+12=30 | | log[2](x-5)-log[2](x+2)=3 | | f(x)=6x^2+x-15 | | -5x^2-20x+35=0 | | 56x+23y= | | 7a-9=-2a+4 | | 5(-5+p)=75 | | -3x^2-24x+17=0 | | 4(x-2)+3x+5=11 | | y^2+20y-41=0 | | 2+10=8 | | 12y^2+24y=5 | | p=9+6ln(4x+1) | | x+5*5=3x*2 | | p^2-26p=41 | | 8-2=-3 | | .10n+12=.12n+10 | | 4x+5x+5+22= | | ln(x)=4.3+ln(6.1) | | 3n^2+16n+21= | | 1+4x=0 | | z^2-20z=0 | | x+6x(7x+1)=0 | | y=-7x+57 |

Equations solver categories