-5x^2-9+14x+10x^2-15x=

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Solution for -5x^2-9+14x+10x^2-15x= equation:


Simplifying
-5x2 + -9 + 14x + 10x2 + -15x = 0

Reorder the terms:
-9 + 14x + -15x + -5x2 + 10x2 = 0

Combine like terms: 14x + -15x = -1x
-9 + -1x + -5x2 + 10x2 = 0

Combine like terms: -5x2 + 10x2 = 5x2
-9 + -1x + 5x2 = 0

Solving
-9 + -1x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
-1.8 + -0.2x + x2 = 0

Move the constant term to the right:

Add '1.8' to each side of the equation.
-1.8 + -0.2x + 1.8 + x2 = 0 + 1.8

Reorder the terms:
-1.8 + 1.8 + -0.2x + x2 = 0 + 1.8

Combine like terms: -1.8 + 1.8 = 0.0
0.0 + -0.2x + x2 = 0 + 1.8
-0.2x + x2 = 0 + 1.8

Combine like terms: 0 + 1.8 = 1.8
-0.2x + x2 = 1.8

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 = 1.8 + 0.01

Reorder the terms:
0.01 + -0.2x + x2 = 1.8 + 0.01

Combine like terms: 1.8 + 0.01 = 1.81
0.01 + -0.2x + x2 = 1.81

Factor a perfect square on the left side:
(x + -0.1)(x + -0.1) = 1.81

Calculate the square root of the right side: 1.345362405

Break this problem into two subproblems by setting 
(x + -0.1) equal to 1.345362405 and -1.345362405.

Subproblem 1

x + -0.1 = 1.345362405 Simplifying x + -0.1 = 1.345362405 Reorder the terms: -0.1 + x = 1.345362405 Solving -0.1 + x = 1.345362405 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 = 1.345362405 + 0.1 Combine like terms: -0.1 + 0.1 = 0.0 0.0 + x = 1.345362405 + 0.1 x = 1.345362405 + 0.1 Combine like terms: 1.345362405 + 0.1 = 1.445362405 x = 1.445362405 Simplifying x = 1.445362405

Subproblem 2

x + -0.1 = -1.345362405 Simplifying x + -0.1 = -1.345362405 Reorder the terms: -0.1 + x = -1.345362405 Solving -0.1 + x = -1.345362405 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 = -1.345362405 + 0.1 Combine like terms: -0.1 + 0.1 = 0.0 0.0 + x = -1.345362405 + 0.1 x = -1.345362405 + 0.1 Combine like terms: -1.345362405 + 0.1 = -1.245362405 x = -1.245362405 Simplifying x = -1.245362405

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.445362405, -1.245362405}

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