3x^2+25=x^2+75x

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Solution for 3x^2+25=x^2+75x equation:


Simplifying
3x2 + 25 = x2 + 75x

Reorder the terms:
25 + 3x2 = x2 + 75x

Reorder the terms:
25 + 3x2 = 75x + x2

Solving
25 + 3x2 = 75x + x2

Solving for variable 'x'.

Reorder the terms:
25 + -75x + 3x2 + -1x2 = 75x + x2 + -75x + -1x2

Combine like terms: 3x2 + -1x2 = 2x2
25 + -75x + 2x2 = 75x + x2 + -75x + -1x2

Reorder the terms:
25 + -75x + 2x2 = 75x + -75x + x2 + -1x2

Combine like terms: 75x + -75x = 0
25 + -75x + 2x2 = 0 + x2 + -1x2
25 + -75x + 2x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
25 + -75x + 2x2 = 0

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

Divide each side by '2'.
12.5 + -37.5x + x2 = 0

Move the constant term to the right:

Add '-12.5' to each side of the equation.
12.5 + -37.5x + -12.5 + x2 = 0 + -12.5

Reorder the terms:
12.5 + -12.5 + -37.5x + x2 = 0 + -12.5

Combine like terms: 12.5 + -12.5 = 0.0
0.0 + -37.5x + x2 = 0 + -12.5
-37.5x + x2 = 0 + -12.5

Combine like terms: 0 + -12.5 = -12.5
-37.5x + x2 = -12.5

The x term is -37.5x.  Take half its coefficient (-18.75).
Square it (351.5625) and add it to both sides.

Add '351.5625' to each side of the equation.
-37.5x + 351.5625 + x2 = -12.5 + 351.5625

Reorder the terms:
351.5625 + -37.5x + x2 = -12.5 + 351.5625

Combine like terms: -12.5 + 351.5625 = 339.0625
351.5625 + -37.5x + x2 = 339.0625

Factor a perfect square on the left side:
(x + -18.75)(x + -18.75) = 339.0625

Calculate the square root of the right side: 18.413649828

Break this problem into two subproblems by setting 
(x + -18.75) equal to 18.413649828 and -18.413649828.

Subproblem 1

x + -18.75 = 18.413649828 Simplifying x + -18.75 = 18.413649828 Reorder the terms: -18.75 + x = 18.413649828 Solving -18.75 + x = 18.413649828 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '18.75' to each side of the equation. -18.75 + 18.75 + x = 18.413649828 + 18.75 Combine like terms: -18.75 + 18.75 = 0.00 0.00 + x = 18.413649828 + 18.75 x = 18.413649828 + 18.75 Combine like terms: 18.413649828 + 18.75 = 37.163649828 x = 37.163649828 Simplifying x = 37.163649828

Subproblem 2

x + -18.75 = -18.413649828 Simplifying x + -18.75 = -18.413649828 Reorder the terms: -18.75 + x = -18.413649828 Solving -18.75 + x = -18.413649828 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '18.75' to each side of the equation. -18.75 + 18.75 + x = -18.413649828 + 18.75 Combine like terms: -18.75 + 18.75 = 0.00 0.00 + x = -18.413649828 + 18.75 x = -18.413649828 + 18.75 Combine like terms: -18.413649828 + 18.75 = 0.336350172 x = 0.336350172 Simplifying x = 0.336350172

Solution

The solution to the problem is based on the solutions from the subproblems. x = {37.163649828, 0.336350172}

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