-5+16x+5x*x=10x+15

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Solution for -5+16x+5x*x=10x+15 equation:


Simplifying
-5 + 16x + 5x * x = 10x + 15

Multiply x * x
-5 + 16x + 5x2 = 10x + 15

Reorder the terms:
-5 + 16x + 5x2 = 15 + 10x

Solving
-5 + 16x + 5x2 = 15 + 10x

Solving for variable 'x'.

Reorder the terms:
-5 + -15 + 16x + -10x + 5x2 = 15 + 10x + -15 + -10x

Combine like terms: -5 + -15 = -20
-20 + 16x + -10x + 5x2 = 15 + 10x + -15 + -10x

Combine like terms: 16x + -10x = 6x
-20 + 6x + 5x2 = 15 + 10x + -15 + -10x

Reorder the terms:
-20 + 6x + 5x2 = 15 + -15 + 10x + -10x

Combine like terms: 15 + -15 = 0
-20 + 6x + 5x2 = 0 + 10x + -10x
-20 + 6x + 5x2 = 10x + -10x

Combine like terms: 10x + -10x = 0
-20 + 6x + 5x2 = 0

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

Divide each side by '5'.
-4 + 1.2x + x2 = 0

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + 1.2x + 4 + x2 = 0 + 4

Reorder the terms:
-4 + 4 + 1.2x + x2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + 1.2x + x2 = 0 + 4
1.2x + x2 = 0 + 4

Combine like terms: 0 + 4 = 4
1.2x + x2 = 4

The x term is 1.2x.  Take half its coefficient (0.6).
Square it (0.36) and add it to both sides.

Add '0.36' to each side of the equation.
1.2x + 0.36 + x2 = 4 + 0.36

Reorder the terms:
0.36 + 1.2x + x2 = 4 + 0.36

Combine like terms: 4 + 0.36 = 4.36
0.36 + 1.2x + x2 = 4.36

Factor a perfect square on the left side:
(x + 0.6)(x + 0.6) = 4.36

Calculate the square root of the right side: 2.088061302

Break this problem into two subproblems by setting 
(x + 0.6) equal to 2.088061302 and -2.088061302.

Subproblem 1

x + 0.6 = 2.088061302 Simplifying x + 0.6 = 2.088061302 Reorder the terms: 0.6 + x = 2.088061302 Solving 0.6 + x = 2.088061302 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.6' to each side of the equation. 0.6 + -0.6 + x = 2.088061302 + -0.6 Combine like terms: 0.6 + -0.6 = 0.0 0.0 + x = 2.088061302 + -0.6 x = 2.088061302 + -0.6 Combine like terms: 2.088061302 + -0.6 = 1.488061302 x = 1.488061302 Simplifying x = 1.488061302

Subproblem 2

x + 0.6 = -2.088061302 Simplifying x + 0.6 = -2.088061302 Reorder the terms: 0.6 + x = -2.088061302 Solving 0.6 + x = -2.088061302 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.6' to each side of the equation. 0.6 + -0.6 + x = -2.088061302 + -0.6 Combine like terms: 0.6 + -0.6 = 0.0 0.0 + x = -2.088061302 + -0.6 x = -2.088061302 + -0.6 Combine like terms: -2.088061302 + -0.6 = -2.688061302 x = -2.688061302 Simplifying x = -2.688061302

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.488061302, -2.688061302}

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