x^2+3x^2-25x-75=0

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Solution for x^2+3x^2-25x-75=0 equation:


Simplifying
x2 + 3x2 + -25x + -75 = 0

Reorder the terms:
-75 + -25x + x2 + 3x2 = 0

Combine like terms: x2 + 3x2 = 4x2
-75 + -25x + 4x2 = 0

Solving
-75 + -25x + 4x2 = 0

Solving for variable 'x'.

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

Divide each side by '4'.
-18.75 + -6.25x + x2 = 0

Move the constant term to the right:

Add '18.75' to each side of the equation.
-18.75 + -6.25x + 18.75 + x2 = 0 + 18.75

Reorder the terms:
-18.75 + 18.75 + -6.25x + x2 = 0 + 18.75

Combine like terms: -18.75 + 18.75 = 0.00
0.00 + -6.25x + x2 = 0 + 18.75
-6.25x + x2 = 0 + 18.75

Combine like terms: 0 + 18.75 = 18.75
-6.25x + x2 = 18.75

The x term is -6.25x.  Take half its coefficient (-3.125).
Square it (9.765625) and add it to both sides.

Add '9.765625' to each side of the equation.
-6.25x + 9.765625 + x2 = 18.75 + 9.765625

Reorder the terms:
9.765625 + -6.25x + x2 = 18.75 + 9.765625

Combine like terms: 18.75 + 9.765625 = 28.515625
9.765625 + -6.25x + x2 = 28.515625

Factor a perfect square on the left side:
(x + -3.125)(x + -3.125) = 28.515625

Calculate the square root of the right side: 5.340002341

Break this problem into two subproblems by setting 
(x + -3.125) equal to 5.340002341 and -5.340002341.

Subproblem 1

x + -3.125 = 5.340002341 Simplifying x + -3.125 = 5.340002341 Reorder the terms: -3.125 + x = 5.340002341 Solving -3.125 + x = 5.340002341 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.125' to each side of the equation. -3.125 + 3.125 + x = 5.340002341 + 3.125 Combine like terms: -3.125 + 3.125 = 0.000 0.000 + x = 5.340002341 + 3.125 x = 5.340002341 + 3.125 Combine like terms: 5.340002341 + 3.125 = 8.465002341 x = 8.465002341 Simplifying x = 8.465002341

Subproblem 2

x + -3.125 = -5.340002341 Simplifying x + -3.125 = -5.340002341 Reorder the terms: -3.125 + x = -5.340002341 Solving -3.125 + x = -5.340002341 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.125' to each side of the equation. -3.125 + 3.125 + x = -5.340002341 + 3.125 Combine like terms: -3.125 + 3.125 = 0.000 0.000 + x = -5.340002341 + 3.125 x = -5.340002341 + 3.125 Combine like terms: -5.340002341 + 3.125 = -2.215002341 x = -2.215002341 Simplifying x = -2.215002341

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.465002341, -2.215002341}

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