5x^2=3x+64

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Solution for 5x^2=3x+64 equation:


Simplifying
5x2 = 3x + 64

Reorder the terms:
5x2 = 64 + 3x

Solving
5x2 = 64 + 3x

Solving for variable 'x'.

Reorder the terms:
-64 + -3x + 5x2 = 64 + 3x + -64 + -3x

Reorder the terms:
-64 + -3x + 5x2 = 64 + -64 + 3x + -3x

Combine like terms: 64 + -64 = 0
-64 + -3x + 5x2 = 0 + 3x + -3x
-64 + -3x + 5x2 = 3x + -3x

Combine like terms: 3x + -3x = 0
-64 + -3x + 5x2 = 0

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

Divide each side by '5'.
-12.8 + -0.6x + x2 = 0

Move the constant term to the right:

Add '12.8' to each side of the equation.
-12.8 + -0.6x + 12.8 + x2 = 0 + 12.8

Reorder the terms:
-12.8 + 12.8 + -0.6x + x2 = 0 + 12.8

Combine like terms: -12.8 + 12.8 = 0.0
0.0 + -0.6x + x2 = 0 + 12.8
-0.6x + x2 = 0 + 12.8

Combine like terms: 0 + 12.8 = 12.8
-0.6x + x2 = 12.8

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 = 12.8 + 0.09

Reorder the terms:
0.09 + -0.6x + x2 = 12.8 + 0.09

Combine like terms: 12.8 + 0.09 = 12.89
0.09 + -0.6x + x2 = 12.89

Factor a perfect square on the left side:
(x + -0.3)(x + -0.3) = 12.89

Calculate the square root of the right side: 3.590264614

Break this problem into two subproblems by setting 
(x + -0.3) equal to 3.590264614 and -3.590264614.

Subproblem 1

x + -0.3 = 3.590264614 Simplifying x + -0.3 = 3.590264614 Reorder the terms: -0.3 + x = 3.590264614 Solving -0.3 + x = 3.590264614 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 = 3.590264614 + 0.3 Combine like terms: -0.3 + 0.3 = 0.0 0.0 + x = 3.590264614 + 0.3 x = 3.590264614 + 0.3 Combine like terms: 3.590264614 + 0.3 = 3.890264614 x = 3.890264614 Simplifying x = 3.890264614

Subproblem 2

x + -0.3 = -3.590264614 Simplifying x + -0.3 = -3.590264614 Reorder the terms: -0.3 + x = -3.590264614 Solving -0.3 + x = -3.590264614 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 = -3.590264614 + 0.3 Combine like terms: -0.3 + 0.3 = 0.0 0.0 + x = -3.590264614 + 0.3 x = -3.590264614 + 0.3 Combine like terms: -3.590264614 + 0.3 = -3.290264614 x = -3.290264614 Simplifying x = -3.290264614

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.890264614, -3.290264614}

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