7x^2-36x+27=0

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Solution for 7x^2-36x+27=0 equation:


Simplifying
7x2 + -36x + 27 = 0

Reorder the terms:
27 + -36x + 7x2 = 0

Solving
27 + -36x + 7x2 = 0

Solving for variable 'x'.

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

Divide each side by '7'.
3.857142857 + -5.142857143x + x2 = 0

Move the constant term to the right:

Add '-3.857142857' to each side of the equation.
3.857142857 + -5.142857143x + -3.857142857 + x2 = 0 + -3.857142857

Reorder the terms:
3.857142857 + -3.857142857 + -5.142857143x + x2 = 0 + -3.857142857

Combine like terms: 3.857142857 + -3.857142857 = 0.000000000
0.000000000 + -5.142857143x + x2 = 0 + -3.857142857
-5.142857143x + x2 = 0 + -3.857142857

Combine like terms: 0 + -3.857142857 = -3.857142857
-5.142857143x + x2 = -3.857142857

The x term is -5.142857143x.  Take half its coefficient (-2.571428572).
Square it (6.612244901) and add it to both sides.

Add '6.612244901' to each side of the equation.
-5.142857143x + 6.612244901 + x2 = -3.857142857 + 6.612244901

Reorder the terms:
6.612244901 + -5.142857143x + x2 = -3.857142857 + 6.612244901

Combine like terms: -3.857142857 + 6.612244901 = 2.755102044
6.612244901 + -5.142857143x + x2 = 2.755102044

Factor a perfect square on the left side:
(x + -2.571428572)(x + -2.571428572) = 2.755102044

Calculate the square root of the right side: 1.659850006

Break this problem into two subproblems by setting 
(x + -2.571428572) equal to 1.659850006 and -1.659850006.

Subproblem 1

x + -2.571428572 = 1.659850006 Simplifying x + -2.571428572 = 1.659850006 Reorder the terms: -2.571428572 + x = 1.659850006 Solving -2.571428572 + x = 1.659850006 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.571428572' to each side of the equation. -2.571428572 + 2.571428572 + x = 1.659850006 + 2.571428572 Combine like terms: -2.571428572 + 2.571428572 = 0.000000000 0.000000000 + x = 1.659850006 + 2.571428572 x = 1.659850006 + 2.571428572 Combine like terms: 1.659850006 + 2.571428572 = 4.231278578 x = 4.231278578 Simplifying x = 4.231278578

Subproblem 2

x + -2.571428572 = -1.659850006 Simplifying x + -2.571428572 = -1.659850006 Reorder the terms: -2.571428572 + x = -1.659850006 Solving -2.571428572 + x = -1.659850006 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.571428572' to each side of the equation. -2.571428572 + 2.571428572 + x = -1.659850006 + 2.571428572 Combine like terms: -2.571428572 + 2.571428572 = 0.000000000 0.000000000 + x = -1.659850006 + 2.571428572 x = -1.659850006 + 2.571428572 Combine like terms: -1.659850006 + 2.571428572 = 0.911578566 x = 0.911578566 Simplifying x = 0.911578566

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.231278578, 0.911578566}

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