3x-10+2x+5+2x(2x+5)=185

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Solution for 3x-10+2x+5+2x(2x+5)=185 equation:


Simplifying
3x + -10 + 2x + 5 + 2x(2x + 5) = 185

Reorder the terms:
3x + -10 + 2x + 5 + 2x(5 + 2x) = 185
3x + -10 + 2x + 5 + (5 * 2x + 2x * 2x) = 185
3x + -10 + 2x + 5 + (10x + 4x2) = 185

Reorder the terms:
-10 + 5 + 3x + 2x + 10x + 4x2 = 185

Combine like terms: -10 + 5 = -5
-5 + 3x + 2x + 10x + 4x2 = 185

Combine like terms: 3x + 2x = 5x
-5 + 5x + 10x + 4x2 = 185

Combine like terms: 5x + 10x = 15x
-5 + 15x + 4x2 = 185

Solving
-5 + 15x + 4x2 = 185

Solving for variable 'x'.

Reorder the terms:
-5 + -185 + 15x + 4x2 = 185 + -185

Combine like terms: -5 + -185 = -190
-190 + 15x + 4x2 = 185 + -185

Combine like terms: 185 + -185 = 0
-190 + 15x + 4x2 = 0

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

Divide each side by '4'.
-47.5 + 3.75x + x2 = 0

Move the constant term to the right:

Add '47.5' to each side of the equation.
-47.5 + 3.75x + 47.5 + x2 = 0 + 47.5

Reorder the terms:
-47.5 + 47.5 + 3.75x + x2 = 0 + 47.5

Combine like terms: -47.5 + 47.5 = 0.0
0.0 + 3.75x + x2 = 0 + 47.5
3.75x + x2 = 0 + 47.5

Combine like terms: 0 + 47.5 = 47.5
3.75x + x2 = 47.5

The x term is 3.75x.  Take half its coefficient (1.875).
Square it (3.515625) and add it to both sides.

Add '3.515625' to each side of the equation.
3.75x + 3.515625 + x2 = 47.5 + 3.515625

Reorder the terms:
3.515625 + 3.75x + x2 = 47.5 + 3.515625

Combine like terms: 47.5 + 3.515625 = 51.015625
3.515625 + 3.75x + x2 = 51.015625

Factor a perfect square on the left side:
(x + 1.875)(x + 1.875) = 51.015625

Calculate the square root of the right side: 7.142522314

Break this problem into two subproblems by setting 
(x + 1.875) equal to 7.142522314 and -7.142522314.

Subproblem 1

x + 1.875 = 7.142522314 Simplifying x + 1.875 = 7.142522314 Reorder the terms: 1.875 + x = 7.142522314 Solving 1.875 + x = 7.142522314 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.875' to each side of the equation. 1.875 + -1.875 + x = 7.142522314 + -1.875 Combine like terms: 1.875 + -1.875 = 0.000 0.000 + x = 7.142522314 + -1.875 x = 7.142522314 + -1.875 Combine like terms: 7.142522314 + -1.875 = 5.267522314 x = 5.267522314 Simplifying x = 5.267522314

Subproblem 2

x + 1.875 = -7.142522314 Simplifying x + 1.875 = -7.142522314 Reorder the terms: 1.875 + x = -7.142522314 Solving 1.875 + x = -7.142522314 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.875' to each side of the equation. 1.875 + -1.875 + x = -7.142522314 + -1.875 Combine like terms: 1.875 + -1.875 = 0.000 0.000 + x = -7.142522314 + -1.875 x = -7.142522314 + -1.875 Combine like terms: -7.142522314 + -1.875 = -9.017522314 x = -9.017522314 Simplifying x = -9.017522314

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.267522314, -9.017522314}

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