0.35x+0.09x(x+4)=0.03(12)

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Solution for 0.35x+0.09x(x+4)=0.03(12) equation:


Simplifying
0.35x + 0.09x(x + 4) = 0.03(12)

Reorder the terms:
0.35x + 0.09x(4 + x) = 0.03(12)
0.35x + (4 * 0.09x + x * 0.09x) = 0.03(12)
0.35x + (0.36x + 0.09x2) = 0.03(12)

Combine like terms: 0.35x + 0.36x = 0.71x
0.71x + 0.09x2 = 0.03(12)

Multiply 0.03 * 12
0.71x + 0.09x2 = 0.36

Solving
0.71x + 0.09x2 = 0.36

Solving for variable 'x'.

Reorder the terms:
-0.36 + 0.71x + 0.09x2 = 0.36 + -0.36

Combine like terms: 0.36 + -0.36 = 0.00
-0.36 + 0.71x + 0.09x2 = 0.00

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

Divide each side by '0.09'.
-4 + 7.888888889x + x2 = 0

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + 7.888888889x + 4 + x2 = 0 + 4

Reorder the terms:
-4 + 4 + 7.888888889x + x2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + 7.888888889x + x2 = 0 + 4
7.888888889x + x2 = 0 + 4

Combine like terms: 0 + 4 = 4
7.888888889x + x2 = 4

The x term is 7.888888889x.  Take half its coefficient (3.944444445).
Square it (15.55864198) and add it to both sides.

Add '15.55864198' to each side of the equation.
7.888888889x + 15.55864198 + x2 = 4 + 15.55864198

Reorder the terms:
15.55864198 + 7.888888889x + x2 = 4 + 15.55864198

Combine like terms: 4 + 15.55864198 = 19.55864198
15.55864198 + 7.888888889x + x2 = 19.55864198

Factor a perfect square on the left side:
(x + 3.944444445)(x + 3.944444445) = 19.55864198

Calculate the square root of the right side: 4.422515345

Break this problem into two subproblems by setting 
(x + 3.944444445) equal to 4.422515345 and -4.422515345.

Subproblem 1

x + 3.944444445 = 4.422515345 Simplifying x + 3.944444445 = 4.422515345 Reorder the terms: 3.944444445 + x = 4.422515345 Solving 3.944444445 + x = 4.422515345 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.944444445' to each side of the equation. 3.944444445 + -3.944444445 + x = 4.422515345 + -3.944444445 Combine like terms: 3.944444445 + -3.944444445 = 0.000000000 0.000000000 + x = 4.422515345 + -3.944444445 x = 4.422515345 + -3.944444445 Combine like terms: 4.422515345 + -3.944444445 = 0.4780709 x = 0.4780709 Simplifying x = 0.4780709

Subproblem 2

x + 3.944444445 = -4.422515345 Simplifying x + 3.944444445 = -4.422515345 Reorder the terms: 3.944444445 + x = -4.422515345 Solving 3.944444445 + x = -4.422515345 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.944444445' to each side of the equation. 3.944444445 + -3.944444445 + x = -4.422515345 + -3.944444445 Combine like terms: 3.944444445 + -3.944444445 = 0.000000000 0.000000000 + x = -4.422515345 + -3.944444445 x = -4.422515345 + -3.944444445 Combine like terms: -4.422515345 + -3.944444445 = -8.36695979 x = -8.36695979 Simplifying x = -8.36695979

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.4780709, -8.36695979}

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