4x^2-1=6x

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Solution for 4x^2-1=6x equation:


Simplifying
4x2 + -1 = 6x

Reorder the terms:
-1 + 4x2 = 6x

Solving
-1 + 4x2 = 6x

Solving for variable 'x'.

Reorder the terms:
-1 + -6x + 4x2 = 6x + -6x

Combine like terms: 6x + -6x = 0
-1 + -6x + 4x2 = 0

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

Divide each side by '4'.
-0.25 + -1.5x + x2 = 0

Move the constant term to the right:

Add '0.25' to each side of the equation.
-0.25 + -1.5x + 0.25 + x2 = 0 + 0.25

Reorder the terms:
-0.25 + 0.25 + -1.5x + x2 = 0 + 0.25

Combine like terms: -0.25 + 0.25 = 0.00
0.00 + -1.5x + x2 = 0 + 0.25
-1.5x + x2 = 0 + 0.25

Combine like terms: 0 + 0.25 = 0.25
-1.5x + x2 = 0.25

The x term is -1.5x.  Take half its coefficient (-0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
-1.5x + 0.5625 + x2 = 0.25 + 0.5625

Reorder the terms:
0.5625 + -1.5x + x2 = 0.25 + 0.5625

Combine like terms: 0.25 + 0.5625 = 0.8125
0.5625 + -1.5x + x2 = 0.8125

Factor a perfect square on the left side:
(x + -0.75)(x + -0.75) = 0.8125

Calculate the square root of the right side: 0.901387819

Break this problem into two subproblems by setting 
(x + -0.75) equal to 0.901387819 and -0.901387819.

Subproblem 1

x + -0.75 = 0.901387819 Simplifying x + -0.75 = 0.901387819 Reorder the terms: -0.75 + x = 0.901387819 Solving -0.75 + x = 0.901387819 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + x = 0.901387819 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = 0.901387819 + 0.75 x = 0.901387819 + 0.75 Combine like terms: 0.901387819 + 0.75 = 1.651387819 x = 1.651387819 Simplifying x = 1.651387819

Subproblem 2

x + -0.75 = -0.901387819 Simplifying x + -0.75 = -0.901387819 Reorder the terms: -0.75 + x = -0.901387819 Solving -0.75 + x = -0.901387819 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + x = -0.901387819 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = -0.901387819 + 0.75 x = -0.901387819 + 0.75 Combine like terms: -0.901387819 + 0.75 = -0.151387819 x = -0.151387819 Simplifying x = -0.151387819

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.651387819, -0.151387819}

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