4x^2-51x=40

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


Simplifying
4x2 + -51x = 40

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

Solving
-51x + 4x2 = 40

Solving for variable 'x'.

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

Combine like terms: 40 + -40 = 0
-40 + -51x + 4x2 = 0

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 = 50.640625
40.640625 + -12.75x + x2 = 50.640625

Factor a perfect square on the left side:
(x + -6.375)(x + -6.375) = 50.640625

Calculate the square root of the right side: 7.116222664

Break this problem into two subproblems by setting 
(x + -6.375) equal to 7.116222664 and -7.116222664.

Subproblem 1

x + -6.375 = 7.116222664 Simplifying x + -6.375 = 7.116222664 Reorder the terms: -6.375 + x = 7.116222664 Solving -6.375 + x = 7.116222664 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 = 7.116222664 + 6.375 Combine like terms: -6.375 + 6.375 = 0.000 0.000 + x = 7.116222664 + 6.375 x = 7.116222664 + 6.375 Combine like terms: 7.116222664 + 6.375 = 13.491222664 x = 13.491222664 Simplifying x = 13.491222664

Subproblem 2

x + -6.375 = -7.116222664 Simplifying x + -6.375 = -7.116222664 Reorder the terms: -6.375 + x = -7.116222664 Solving -6.375 + x = -7.116222664 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 = -7.116222664 + 6.375 Combine like terms: -6.375 + 6.375 = 0.000 0.000 + x = -7.116222664 + 6.375 x = -7.116222664 + 6.375 Combine like terms: -7.116222664 + 6.375 = -0.741222664 x = -0.741222664 Simplifying x = -0.741222664

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.491222664, -0.741222664}

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