5x^2-10x-16=4x

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Solution for 5x^2-10x-16=4x equation:


Simplifying
5x2 + -10x + -16 = 4x

Reorder the terms:
-16 + -10x + 5x2 = 4x

Solving
-16 + -10x + 5x2 = 4x

Solving for variable 'x'.

Reorder the terms:
-16 + -10x + -4x + 5x2 = 4x + -4x

Combine like terms: -10x + -4x = -14x
-16 + -14x + 5x2 = 4x + -4x

Combine like terms: 4x + -4x = 0
-16 + -14x + 5x2 = 0

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

Divide each side by '5'.
-3.2 + -2.8x + x2 = 0

Move the constant term to the right:

Add '3.2' to each side of the equation.
-3.2 + -2.8x + 3.2 + x2 = 0 + 3.2

Reorder the terms:
-3.2 + 3.2 + -2.8x + x2 = 0 + 3.2

Combine like terms: -3.2 + 3.2 = 0.0
0.0 + -2.8x + x2 = 0 + 3.2
-2.8x + x2 = 0 + 3.2

Combine like terms: 0 + 3.2 = 3.2
-2.8x + x2 = 3.2

The x term is -2.8x.  Take half its coefficient (-1.4).
Square it (1.96) and add it to both sides.

Add '1.96' to each side of the equation.
-2.8x + 1.96 + x2 = 3.2 + 1.96

Reorder the terms:
1.96 + -2.8x + x2 = 3.2 + 1.96

Combine like terms: 3.2 + 1.96 = 5.16
1.96 + -2.8x + x2 = 5.16

Factor a perfect square on the left side:
(x + -1.4)(x + -1.4) = 5.16

Calculate the square root of the right side: 2.271563338

Break this problem into two subproblems by setting 
(x + -1.4) equal to 2.271563338 and -2.271563338.

Subproblem 1

x + -1.4 = 2.271563338 Simplifying x + -1.4 = 2.271563338 Reorder the terms: -1.4 + x = 2.271563338 Solving -1.4 + x = 2.271563338 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.4' to each side of the equation. -1.4 + 1.4 + x = 2.271563338 + 1.4 Combine like terms: -1.4 + 1.4 = 0.0 0.0 + x = 2.271563338 + 1.4 x = 2.271563338 + 1.4 Combine like terms: 2.271563338 + 1.4 = 3.671563338 x = 3.671563338 Simplifying x = 3.671563338

Subproblem 2

x + -1.4 = -2.271563338 Simplifying x + -1.4 = -2.271563338 Reorder the terms: -1.4 + x = -2.271563338 Solving -1.4 + x = -2.271563338 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.4' to each side of the equation. -1.4 + 1.4 + x = -2.271563338 + 1.4 Combine like terms: -1.4 + 1.4 = 0.0 0.0 + x = -2.271563338 + 1.4 x = -2.271563338 + 1.4 Combine like terms: -2.271563338 + 1.4 = -0.871563338 x = -0.871563338 Simplifying x = -0.871563338

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.671563338, -0.871563338}

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