5x=11-25x^2+15

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Solution for 5x=11-25x^2+15 equation:


Simplifying
5x = 11 + -25x2 + 15

Reorder the terms:
5x = 11 + 15 + -25x2

Combine like terms: 11 + 15 = 26
5x = 26 + -25x2

Solving
5x = 26 + -25x2

Solving for variable 'x'.

Reorder the terms:
-26 + 5x + 25x2 = 26 + -25x2 + -26 + 25x2

Reorder the terms:
-26 + 5x + 25x2 = 26 + -26 + -25x2 + 25x2

Combine like terms: 26 + -26 = 0
-26 + 5x + 25x2 = 0 + -25x2 + 25x2
-26 + 5x + 25x2 = -25x2 + 25x2

Combine like terms: -25x2 + 25x2 = 0
-26 + 5x + 25x2 = 0

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

Divide each side by '25'.
-1.04 + 0.2x + x2 = 0

Move the constant term to the right:

Add '1.04' to each side of the equation.
-1.04 + 0.2x + 1.04 + x2 = 0 + 1.04

Reorder the terms:
-1.04 + 1.04 + 0.2x + x2 = 0 + 1.04

Combine like terms: -1.04 + 1.04 = 0.00
0.00 + 0.2x + x2 = 0 + 1.04
0.2x + x2 = 0 + 1.04

Combine like terms: 0 + 1.04 = 1.04
0.2x + x2 = 1.04

The x term is 0.2x.  Take half its coefficient (0.1).
Square it (0.01) and add it to both sides.

Add '0.01' to each side of the equation.
0.2x + 0.01 + x2 = 1.04 + 0.01

Reorder the terms:
0.01 + 0.2x + x2 = 1.04 + 0.01

Combine like terms: 1.04 + 0.01 = 1.05
0.01 + 0.2x + x2 = 1.05

Factor a perfect square on the left side:
(x + 0.1)(x + 0.1) = 1.05

Calculate the square root of the right side: 1.024695077

Break this problem into two subproblems by setting 
(x + 0.1) equal to 1.024695077 and -1.024695077.

Subproblem 1

x + 0.1 = 1.024695077 Simplifying x + 0.1 = 1.024695077 Reorder the terms: 0.1 + x = 1.024695077 Solving 0.1 + x = 1.024695077 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1' to each side of the equation. 0.1 + -0.1 + x = 1.024695077 + -0.1 Combine like terms: 0.1 + -0.1 = 0.0 0.0 + x = 1.024695077 + -0.1 x = 1.024695077 + -0.1 Combine like terms: 1.024695077 + -0.1 = 0.924695077 x = 0.924695077 Simplifying x = 0.924695077

Subproblem 2

x + 0.1 = -1.024695077 Simplifying x + 0.1 = -1.024695077 Reorder the terms: 0.1 + x = -1.024695077 Solving 0.1 + x = -1.024695077 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1' to each side of the equation. 0.1 + -0.1 + x = -1.024695077 + -0.1 Combine like terms: 0.1 + -0.1 = 0.0 0.0 + x = -1.024695077 + -0.1 x = -1.024695077 + -0.1 Combine like terms: -1.024695077 + -0.1 = -1.124695077 x = -1.124695077 Simplifying x = -1.124695077

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.924695077, -1.124695077}

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