(4.7x+14.1)(2.4x-3.6)=0

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Solution for (4.7x+14.1)(2.4x-3.6)=0 equation:


Simplifying
(4.7x + 14.1)(2.4x + -3.6) = 0

Reorder the terms:
(14.1 + 4.7x)(2.4x + -3.6) = 0

Reorder the terms:
(14.1 + 4.7x)(-3.6 + 2.4x) = 0

Multiply (14.1 + 4.7x) * (-3.6 + 2.4x)
(14.1(-3.6 + 2.4x) + 4.7x * (-3.6 + 2.4x)) = 0
((-3.6 * 14.1 + 2.4x * 14.1) + 4.7x * (-3.6 + 2.4x)) = 0
((-50.76 + 33.84x) + 4.7x * (-3.6 + 2.4x)) = 0
(-50.76 + 33.84x + (-3.6 * 4.7x + 2.4x * 4.7x)) = 0
(-50.76 + 33.84x + (-16.92x + 11.28x2)) = 0

Combine like terms: 33.84x + -16.92x = 16.92x
(-50.76 + 16.92x + 11.28x2) = 0

Solving
-50.76 + 16.92x + 11.28x2 = 0

Solving for variable 'x'.

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

Divide each side by '11.28'.
-4.5 + 1.5x + x2 = 0

Move the constant term to the right:

Add '4.5' to each side of the equation.
-4.5 + 1.5x + 4.5 + x2 = 0 + 4.5

Reorder the terms:
-4.5 + 4.5 + 1.5x + x2 = 0 + 4.5

Combine like terms: -4.5 + 4.5 = 0.0
0.0 + 1.5x + x2 = 0 + 4.5
1.5x + x2 = 0 + 4.5

Combine like terms: 0 + 4.5 = 4.5
1.5x + x2 = 4.5

The x term is 1.5x.  Take half its coefficient (0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
1.5x + 0.5625 + x2 = 4.5 + 0.5625

Reorder the terms:
0.5625 + 1.5x + x2 = 4.5 + 0.5625

Combine like terms: 4.5 + 0.5625 = 5.0625
0.5625 + 1.5x + x2 = 5.0625

Factor a perfect square on the left side:
(x + 0.75)(x + 0.75) = 5.0625

Calculate the square root of the right side: 2.25

Break this problem into two subproblems by setting 
(x + 0.75) equal to 2.25 and -2.25.

Subproblem 1

x + 0.75 = 2.25 Simplifying x + 0.75 = 2.25 Reorder the terms: 0.75 + x = 2.25 Solving 0.75 + x = 2.25 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = 2.25 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = 2.25 + -0.75 x = 2.25 + -0.75 Combine like terms: 2.25 + -0.75 = 1.5 x = 1.5 Simplifying x = 1.5

Subproblem 2

x + 0.75 = -2.25 Simplifying x + 0.75 = -2.25 Reorder the terms: 0.75 + x = -2.25 Solving 0.75 + x = -2.25 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = -2.25 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = -2.25 + -0.75 x = -2.25 + -0.75 Combine like terms: -2.25 + -0.75 = -3 x = -3 Simplifying x = -3

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.5, -3}

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