2x^2+16x=5

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Solution for 2x^2+16x=5 equation:


Simplifying
2x2 + 16x = 5

Reorder the terms:
16x + 2x2 = 5

Solving
16x + 2x2 = 5

Solving for variable 'x'.

Reorder the terms:
-5 + 16x + 2x2 = 5 + -5

Combine like terms: 5 + -5 = 0
-5 + 16x + 2x2 = 0

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

Divide each side by '2'.
-2.5 + 8x + x2 = 0

Move the constant term to the right:

Add '2.5' to each side of the equation.
-2.5 + 8x + 2.5 + x2 = 0 + 2.5

Reorder the terms:
-2.5 + 2.5 + 8x + x2 = 0 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + 8x + x2 = 0 + 2.5
8x + x2 = 0 + 2.5

Combine like terms: 0 + 2.5 = 2.5
8x + x2 = 2.5

The x term is 8x.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8x + 16 + x2 = 2.5 + 16

Reorder the terms:
16 + 8x + x2 = 2.5 + 16

Combine like terms: 2.5 + 16 = 18.5
16 + 8x + x2 = 18.5

Factor a perfect square on the left side:
(x + 4)(x + 4) = 18.5

Calculate the square root of the right side: 4.301162634

Break this problem into two subproblems by setting 
(x + 4) equal to 4.301162634 and -4.301162634.

Subproblem 1

x + 4 = 4.301162634 Simplifying x + 4 = 4.301162634 Reorder the terms: 4 + x = 4.301162634 Solving 4 + x = 4.301162634 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = 4.301162634 + -4 Combine like terms: 4 + -4 = 0 0 + x = 4.301162634 + -4 x = 4.301162634 + -4 Combine like terms: 4.301162634 + -4 = 0.301162634 x = 0.301162634 Simplifying x = 0.301162634

Subproblem 2

x + 4 = -4.301162634 Simplifying x + 4 = -4.301162634 Reorder the terms: 4 + x = -4.301162634 Solving 4 + x = -4.301162634 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = -4.301162634 + -4 Combine like terms: 4 + -4 = 0 0 + x = -4.301162634 + -4 x = -4.301162634 + -4 Combine like terms: -4.301162634 + -4 = -8.301162634 x = -8.301162634 Simplifying x = -8.301162634

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.301162634, -8.301162634}

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