0.2x(2x-15)+0.6x=4.25

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Solution for 0.2x(2x-15)+0.6x=4.25 equation:


Simplifying
0.2x(2x + -15) + 0.6x = 4.25

Reorder the terms:
0.2x(-15 + 2x) + 0.6x = 4.25
(-15 * 0.2x + 2x * 0.2x) + 0.6x = 4.25
(-3x + 0.4x2) + 0.6x = 4.25

Reorder the terms:
-3x + 0.6x + 0.4x2 = 4.25

Combine like terms: -3x + 0.6x = -2.4x
-2.4x + 0.4x2 = 4.25

Solving
-2.4x + 0.4x2 = 4.25

Solving for variable 'x'.

Reorder the terms:
-4.25 + -2.4x + 0.4x2 = 4.25 + -4.25

Combine like terms: 4.25 + -4.25 = 0.00
-4.25 + -2.4x + 0.4x2 = 0.00

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

Divide each side by '0.4'.
-10.625 + -6x + x2 = 0.0

Move the constant term to the right:

Add '10.625' to each side of the equation.
-10.625 + -6x + 10.625 + x2 = 0.0 + 10.625

Reorder the terms:
-10.625 + 10.625 + -6x + x2 = 0.0 + 10.625

Combine like terms: -10.625 + 10.625 = 0.000
0.000 + -6x + x2 = 0.0 + 10.625
-6x + x2 = 0.0 + 10.625

Combine like terms: 0.0 + 10.625 = 10.625
-6x + x2 = 10.625

The x term is -6x.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6x + 9 + x2 = 10.625 + 9

Reorder the terms:
9 + -6x + x2 = 10.625 + 9

Combine like terms: 10.625 + 9 = 19.625
9 + -6x + x2 = 19.625

Factor a perfect square on the left side:
(x + -3)(x + -3) = 19.625

Calculate the square root of the right side: 4.430011287

Break this problem into two subproblems by setting 
(x + -3) equal to 4.430011287 and -4.430011287.

Subproblem 1

x + -3 = 4.430011287 Simplifying x + -3 = 4.430011287 Reorder the terms: -3 + x = 4.430011287 Solving -3 + x = 4.430011287 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = 4.430011287 + 3 Combine like terms: -3 + 3 = 0 0 + x = 4.430011287 + 3 x = 4.430011287 + 3 Combine like terms: 4.430011287 + 3 = 7.430011287 x = 7.430011287 Simplifying x = 7.430011287

Subproblem 2

x + -3 = -4.430011287 Simplifying x + -3 = -4.430011287 Reorder the terms: -3 + x = -4.430011287 Solving -3 + x = -4.430011287 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = -4.430011287 + 3 Combine like terms: -3 + 3 = 0 0 + x = -4.430011287 + 3 x = -4.430011287 + 3 Combine like terms: -4.430011287 + 3 = -1.430011287 x = -1.430011287 Simplifying x = -1.430011287

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.430011287, -1.430011287}

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