(0.2x-3)(0.2x-3)=

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Solution for (0.2x-3)(0.2x-3)= equation:


Simplifying
(0.2x + -3)(0.2x + -3) = 0

Reorder the terms:
(-3 + 0.2x)(0.2x + -3) = 0

Reorder the terms:
(-3 + 0.2x)(-3 + 0.2x) = 0

Multiply (-3 + 0.2x) * (-3 + 0.2x)
(-3(-3 + 0.2x) + 0.2x * (-3 + 0.2x)) = 0
((-3 * -3 + 0.2x * -3) + 0.2x * (-3 + 0.2x)) = 0
((9 + -0.6x) + 0.2x * (-3 + 0.2x)) = 0
(9 + -0.6x + (-3 * 0.2x + 0.2x * 0.2x)) = 0
(9 + -0.6x + (-0.6x + 0.04x2)) = 0

Combine like terms: -0.6x + -0.6x = -1.2x
(9 + -1.2x + 0.04x2) = 0

Solving
9 + -1.2x + 0.04x2 = 0

Solving for variable 'x'.

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

Divide each side by '0.04'.
225 + -30x + x2 = 0

Move the constant term to the right:

Add '-225' to each side of the equation.
225 + -30x + -225 + x2 = 0 + -225

Reorder the terms:
225 + -225 + -30x + x2 = 0 + -225

Combine like terms: 225 + -225 = 0
0 + -30x + x2 = 0 + -225
-30x + x2 = 0 + -225

Combine like terms: 0 + -225 = -225
-30x + x2 = -225

The x term is -30x.  Take half its coefficient (-15).
Square it (225) and add it to both sides.

Add '225' to each side of the equation.
-30x + 225 + x2 = -225 + 225

Reorder the terms:
225 + -30x + x2 = -225 + 225

Combine like terms: -225 + 225 = 0
225 + -30x + x2 = 0

Factor a perfect square on the left side:
(x + -15)(x + -15) = 0

Calculate the square root of the right side: 0

Break this problem into two subproblems by setting 
(x + -15) equal to 0 and 0.

Subproblem 1

x + -15 = 0 Simplifying x + -15 = 0 Reorder the terms: -15 + x = 0 Solving -15 + x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + x = 0 + 15 Combine like terms: -15 + 15 = 0 0 + x = 0 + 15 x = 0 + 15 Combine like terms: 0 + 15 = 15 x = 15 Simplifying x = 15

Subproblem 2

x + -15 = 0 Simplifying x + -15 = 0 Reorder the terms: -15 + x = 0 Solving -15 + x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + x = 0 + 15 Combine like terms: -15 + 15 = 0 0 + x = 0 + 15 x = 0 + 15 Combine like terms: 0 + 15 = 15 x = 15 Simplifying x = 15

Solution

The solution to the problem is based on the solutions from the subproblems. x = {15, 15}

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