4x^2-6x-51=0

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Solution for 4x^2-6x-51=0 equation:


Simplifying
4x2 + -6x + -51 = 0

Reorder the terms:
-51 + -6x + 4x2 = 0

Solving
-51 + -6x + 4x2 = 0

Solving for variable 'x'.

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

Divide each side by '4'.
-12.75 + -1.5x + x2 = 0

Move the constant term to the right:

Add '12.75' to each side of the equation.
-12.75 + -1.5x + 12.75 + x2 = 0 + 12.75

Reorder the terms:
-12.75 + 12.75 + -1.5x + x2 = 0 + 12.75

Combine like terms: -12.75 + 12.75 = 0.00
0.00 + -1.5x + x2 = 0 + 12.75
-1.5x + x2 = 0 + 12.75

Combine like terms: 0 + 12.75 = 12.75
-1.5x + x2 = 12.75

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 = 12.75 + 0.5625

Reorder the terms:
0.5625 + -1.5x + x2 = 12.75 + 0.5625

Combine like terms: 12.75 + 0.5625 = 13.3125
0.5625 + -1.5x + x2 = 13.3125

Factor a perfect square on the left side:
(x + -0.75)(x + -0.75) = 13.3125

Calculate the square root of the right side: 3.64862988

Break this problem into two subproblems by setting 
(x + -0.75) equal to 3.64862988 and -3.64862988.

Subproblem 1

x + -0.75 = 3.64862988 Simplifying x + -0.75 = 3.64862988 Reorder the terms: -0.75 + x = 3.64862988 Solving -0.75 + x = 3.64862988 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 = 3.64862988 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = 3.64862988 + 0.75 x = 3.64862988 + 0.75 Combine like terms: 3.64862988 + 0.75 = 4.39862988 x = 4.39862988 Simplifying x = 4.39862988

Subproblem 2

x + -0.75 = -3.64862988 Simplifying x + -0.75 = -3.64862988 Reorder the terms: -0.75 + x = -3.64862988 Solving -0.75 + x = -3.64862988 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 = -3.64862988 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = -3.64862988 + 0.75 x = -3.64862988 + 0.75 Combine like terms: -3.64862988 + 0.75 = -2.89862988 x = -2.89862988 Simplifying x = -2.89862988

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.39862988, -2.89862988}

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