5x^2=3x+56

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Solution for 5x^2=3x+56 equation:


Simplifying
5x2 = 3x + 56

Reorder the terms:
5x2 = 56 + 3x

Solving
5x2 = 56 + 3x

Solving for variable 'x'.

Reorder the terms:
-56 + -3x + 5x2 = 56 + 3x + -56 + -3x

Reorder the terms:
-56 + -3x + 5x2 = 56 + -56 + 3x + -3x

Combine like terms: 56 + -56 = 0
-56 + -3x + 5x2 = 0 + 3x + -3x
-56 + -3x + 5x2 = 3x + -3x

Combine like terms: 3x + -3x = 0
-56 + -3x + 5x2 = 0

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

Divide each side by '5'.
-11.2 + -0.6x + x2 = 0

Move the constant term to the right:

Add '11.2' to each side of the equation.
-11.2 + -0.6x + 11.2 + x2 = 0 + 11.2

Reorder the terms:
-11.2 + 11.2 + -0.6x + x2 = 0 + 11.2

Combine like terms: -11.2 + 11.2 = 0.0
0.0 + -0.6x + x2 = 0 + 11.2
-0.6x + x2 = 0 + 11.2

Combine like terms: 0 + 11.2 = 11.2
-0.6x + x2 = 11.2

The x term is -0.6x.  Take half its coefficient (-0.3).
Square it (0.09) and add it to both sides.

Add '0.09' to each side of the equation.
-0.6x + 0.09 + x2 = 11.2 + 0.09

Reorder the terms:
0.09 + -0.6x + x2 = 11.2 + 0.09

Combine like terms: 11.2 + 0.09 = 11.29
0.09 + -0.6x + x2 = 11.29

Factor a perfect square on the left side:
(x + -0.3)(x + -0.3) = 11.29

Calculate the square root of the right side: 3.360059523

Break this problem into two subproblems by setting 
(x + -0.3) equal to 3.360059523 and -3.360059523.

Subproblem 1

x + -0.3 = 3.360059523 Simplifying x + -0.3 = 3.360059523 Reorder the terms: -0.3 + x = 3.360059523 Solving -0.3 + x = 3.360059523 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3' to each side of the equation. -0.3 + 0.3 + x = 3.360059523 + 0.3 Combine like terms: -0.3 + 0.3 = 0.0 0.0 + x = 3.360059523 + 0.3 x = 3.360059523 + 0.3 Combine like terms: 3.360059523 + 0.3 = 3.660059523 x = 3.660059523 Simplifying x = 3.660059523

Subproblem 2

x + -0.3 = -3.360059523 Simplifying x + -0.3 = -3.360059523 Reorder the terms: -0.3 + x = -3.360059523 Solving -0.3 + x = -3.360059523 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3' to each side of the equation. -0.3 + 0.3 + x = -3.360059523 + 0.3 Combine like terms: -0.3 + 0.3 = 0.0 0.0 + x = -3.360059523 + 0.3 x = -3.360059523 + 0.3 Combine like terms: -3.360059523 + 0.3 = -3.060059523 x = -3.060059523 Simplifying x = -3.060059523

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.660059523, -3.060059523}

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