5x^2=15-8x

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Solution for 5x^2=15-8x equation:


Simplifying
5x2 = 15 + -8x

Solving
5x2 = 15 + -8x

Solving for variable 'x'.

Reorder the terms:
-15 + 8x + 5x2 = 15 + -8x + -15 + 8x

Reorder the terms:
-15 + 8x + 5x2 = 15 + -15 + -8x + 8x

Combine like terms: 15 + -15 = 0
-15 + 8x + 5x2 = 0 + -8x + 8x
-15 + 8x + 5x2 = -8x + 8x

Combine like terms: -8x + 8x = 0
-15 + 8x + 5x2 = 0

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

Divide each side by '5'.
-3 + 1.6x + x2 = 0

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + 1.6x + 3 + x2 = 0 + 3

Reorder the terms:
-3 + 3 + 1.6x + x2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + 1.6x + x2 = 0 + 3
1.6x + x2 = 0 + 3

Combine like terms: 0 + 3 = 3
1.6x + x2 = 3

The x term is 1.6x.  Take half its coefficient (0.8).
Square it (0.64) and add it to both sides.

Add '0.64' to each side of the equation.
1.6x + 0.64 + x2 = 3 + 0.64

Reorder the terms:
0.64 + 1.6x + x2 = 3 + 0.64

Combine like terms: 3 + 0.64 = 3.64
0.64 + 1.6x + x2 = 3.64

Factor a perfect square on the left side:
(x + 0.8)(x + 0.8) = 3.64

Calculate the square root of the right side: 1.907878403

Break this problem into two subproblems by setting 
(x + 0.8) equal to 1.907878403 and -1.907878403.

Subproblem 1

x + 0.8 = 1.907878403 Simplifying x + 0.8 = 1.907878403 Reorder the terms: 0.8 + x = 1.907878403 Solving 0.8 + x = 1.907878403 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.8' to each side of the equation. 0.8 + -0.8 + x = 1.907878403 + -0.8 Combine like terms: 0.8 + -0.8 = 0.0 0.0 + x = 1.907878403 + -0.8 x = 1.907878403 + -0.8 Combine like terms: 1.907878403 + -0.8 = 1.107878403 x = 1.107878403 Simplifying x = 1.107878403

Subproblem 2

x + 0.8 = -1.907878403 Simplifying x + 0.8 = -1.907878403 Reorder the terms: 0.8 + x = -1.907878403 Solving 0.8 + x = -1.907878403 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.8' to each side of the equation. 0.8 + -0.8 + x = -1.907878403 + -0.8 Combine like terms: 0.8 + -0.8 = 0.0 0.0 + x = -1.907878403 + -0.8 x = -1.907878403 + -0.8 Combine like terms: -1.907878403 + -0.8 = -2.707878403 x = -2.707878403 Simplifying x = -2.707878403

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.107878403, -2.707878403}

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