5x+8x^2-52=0

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Solution for 5x+8x^2-52=0 equation:


Simplifying
5x + 8x2 + -52 = 0

Reorder the terms:
-52 + 5x + 8x2 = 0

Solving
-52 + 5x + 8x2 = 0

Solving for variable 'x'.

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

Divide each side by '8'.
-6.5 + 0.625x + x2 = 0

Move the constant term to the right:

Add '6.5' to each side of the equation.
-6.5 + 0.625x + 6.5 + x2 = 0 + 6.5

Reorder the terms:
-6.5 + 6.5 + 0.625x + x2 = 0 + 6.5

Combine like terms: -6.5 + 6.5 = 0.0
0.0 + 0.625x + x2 = 0 + 6.5
0.625x + x2 = 0 + 6.5

Combine like terms: 0 + 6.5 = 6.5
0.625x + x2 = 6.5

The x term is 0.625x.  Take half its coefficient (0.3125).
Square it (0.09765625) and add it to both sides.

Add '0.09765625' to each side of the equation.
0.625x + 0.09765625 + x2 = 6.5 + 0.09765625

Reorder the terms:
0.09765625 + 0.625x + x2 = 6.5 + 0.09765625

Combine like terms: 6.5 + 0.09765625 = 6.59765625
0.09765625 + 0.625x + x2 = 6.59765625

Factor a perfect square on the left side:
(x + 0.3125)(x + 0.3125) = 6.59765625

Calculate the square root of the right side: 2.568590324

Break this problem into two subproblems by setting 
(x + 0.3125) equal to 2.568590324 and -2.568590324.

Subproblem 1

x + 0.3125 = 2.568590324 Simplifying x + 0.3125 = 2.568590324 Reorder the terms: 0.3125 + x = 2.568590324 Solving 0.3125 + x = 2.568590324 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3125' to each side of the equation. 0.3125 + -0.3125 + x = 2.568590324 + -0.3125 Combine like terms: 0.3125 + -0.3125 = 0.0000 0.0000 + x = 2.568590324 + -0.3125 x = 2.568590324 + -0.3125 Combine like terms: 2.568590324 + -0.3125 = 2.256090324 x = 2.256090324 Simplifying x = 2.256090324

Subproblem 2

x + 0.3125 = -2.568590324 Simplifying x + 0.3125 = -2.568590324 Reorder the terms: 0.3125 + x = -2.568590324 Solving 0.3125 + x = -2.568590324 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3125' to each side of the equation. 0.3125 + -0.3125 + x = -2.568590324 + -0.3125 Combine like terms: 0.3125 + -0.3125 = 0.0000 0.0000 + x = -2.568590324 + -0.3125 x = -2.568590324 + -0.3125 Combine like terms: -2.568590324 + -0.3125 = -2.881090324 x = -2.881090324 Simplifying x = -2.881090324

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.256090324, -2.881090324}

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