4x^2-51x+40=0

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Solution for 4x^2-51x+40=0 equation:


Simplifying
4x2 + -51x + 40 = 0

Reorder the terms:
40 + -51x + 4x2 = 0

Solving
40 + -51x + 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'.
10 + -12.75x + x2 = 0

Move the constant term to the right:

Add '-10' to each side of the equation.
10 + -12.75x + -10 + x2 = 0 + -10

Reorder the terms:
10 + -10 + -12.75x + x2 = 0 + -10

Combine like terms: 10 + -10 = 0
0 + -12.75x + x2 = 0 + -10
-12.75x + x2 = 0 + -10

Combine like terms: 0 + -10 = -10
-12.75x + x2 = -10

The x term is -12.75x.  Take half its coefficient (-6.375).
Square it (40.640625) and add it to both sides.

Add '40.640625' to each side of the equation.
-12.75x + 40.640625 + x2 = -10 + 40.640625

Reorder the terms:
40.640625 + -12.75x + x2 = -10 + 40.640625

Combine like terms: -10 + 40.640625 = 30.640625
40.640625 + -12.75x + x2 = 30.640625

Factor a perfect square on the left side:
(x + -6.375)(x + -6.375) = 30.640625

Calculate the square root of the right side: 5.535397456

Break this problem into two subproblems by setting 
(x + -6.375) equal to 5.535397456 and -5.535397456.

Subproblem 1

x + -6.375 = 5.535397456 Simplifying x + -6.375 = 5.535397456 Reorder the terms: -6.375 + x = 5.535397456 Solving -6.375 + x = 5.535397456 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.375' to each side of the equation. -6.375 + 6.375 + x = 5.535397456 + 6.375 Combine like terms: -6.375 + 6.375 = 0.000 0.000 + x = 5.535397456 + 6.375 x = 5.535397456 + 6.375 Combine like terms: 5.535397456 + 6.375 = 11.910397456 x = 11.910397456 Simplifying x = 11.910397456

Subproblem 2

x + -6.375 = -5.535397456 Simplifying x + -6.375 = -5.535397456 Reorder the terms: -6.375 + x = -5.535397456 Solving -6.375 + x = -5.535397456 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.375' to each side of the equation. -6.375 + 6.375 + x = -5.535397456 + 6.375 Combine like terms: -6.375 + 6.375 = 0.000 0.000 + x = -5.535397456 + 6.375 x = -5.535397456 + 6.375 Combine like terms: -5.535397456 + 6.375 = 0.839602544 x = 0.839602544 Simplifying x = 0.839602544

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.910397456, 0.839602544}

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