25x^2-30x=166

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Solution for 25x^2-30x=166 equation:


Simplifying
25x2 + -30x = 166

Reorder the terms:
-30x + 25x2 = 166

Solving
-30x + 25x2 = 166

Solving for variable 'x'.

Reorder the terms:
-166 + -30x + 25x2 = 166 + -166

Combine like terms: 166 + -166 = 0
-166 + -30x + 25x2 = 0

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

Divide each side by '25'.
-6.64 + -1.2x + x2 = 0

Move the constant term to the right:

Add '6.64' to each side of the equation.
-6.64 + -1.2x + 6.64 + x2 = 0 + 6.64

Reorder the terms:
-6.64 + 6.64 + -1.2x + x2 = 0 + 6.64

Combine like terms: -6.64 + 6.64 = 0.00
0.00 + -1.2x + x2 = 0 + 6.64
-1.2x + x2 = 0 + 6.64

Combine like terms: 0 + 6.64 = 6.64
-1.2x + x2 = 6.64

The x term is -1.2x.  Take half its coefficient (-0.6).
Square it (0.36) and add it to both sides.

Add '0.36' to each side of the equation.
-1.2x + 0.36 + x2 = 6.64 + 0.36

Reorder the terms:
0.36 + -1.2x + x2 = 6.64 + 0.36

Combine like terms: 6.64 + 0.36 = 7
0.36 + -1.2x + x2 = 7

Factor a perfect square on the left side:
(x + -0.6)(x + -0.6) = 7

Calculate the square root of the right side: 2.645751311

Break this problem into two subproblems by setting 
(x + -0.6) equal to 2.645751311 and -2.645751311.

Subproblem 1

x + -0.6 = 2.645751311 Simplifying x + -0.6 = 2.645751311 Reorder the terms: -0.6 + x = 2.645751311 Solving -0.6 + x = 2.645751311 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.6' to each side of the equation. -0.6 + 0.6 + x = 2.645751311 + 0.6 Combine like terms: -0.6 + 0.6 = 0.0 0.0 + x = 2.645751311 + 0.6 x = 2.645751311 + 0.6 Combine like terms: 2.645751311 + 0.6 = 3.245751311 x = 3.245751311 Simplifying x = 3.245751311

Subproblem 2

x + -0.6 = -2.645751311 Simplifying x + -0.6 = -2.645751311 Reorder the terms: -0.6 + x = -2.645751311 Solving -0.6 + x = -2.645751311 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.6' to each side of the equation. -0.6 + 0.6 + x = -2.645751311 + 0.6 Combine like terms: -0.6 + 0.6 = 0.0 0.0 + x = -2.645751311 + 0.6 x = -2.645751311 + 0.6 Combine like terms: -2.645751311 + 0.6 = -2.045751311 x = -2.045751311 Simplifying x = -2.045751311

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.245751311, -2.045751311}

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