(x-7.5)(x+4.3)=0

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Solution for (x-7.5)(x+4.3)=0 equation:


Simplifying
(x + -7.5)(x + 4.3) = 0

Reorder the terms:
(-7.5 + x)(x + 4.3) = 0

Reorder the terms:
(-7.5 + x)(4.3 + x) = 0

Multiply (-7.5 + x) * (4.3 + x)
(-7.5(4.3 + x) + x(4.3 + x)) = 0
((4.3 * -7.5 + x * -7.5) + x(4.3 + x)) = 0
((-32.25 + -7.5x) + x(4.3 + x)) = 0
(-32.25 + -7.5x + (4.3 * x + x * x)) = 0
(-32.25 + -7.5x + (4.3x + x2)) = 0

Combine like terms: -7.5x + 4.3x = -3.2x
(-32.25 + -3.2x + x2) = 0

Solving
-32.25 + -3.2x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '32.25' to each side of the equation.
-32.25 + -3.2x + 32.25 + x2 = 0 + 32.25

Reorder the terms:
-32.25 + 32.25 + -3.2x + x2 = 0 + 32.25

Combine like terms: -32.25 + 32.25 = 0.00
0.00 + -3.2x + x2 = 0 + 32.25
-3.2x + x2 = 0 + 32.25

Combine like terms: 0 + 32.25 = 32.25
-3.2x + x2 = 32.25

The x term is -3.2x.  Take half its coefficient (-1.6).
Square it (2.56) and add it to both sides.

Add '2.56' to each side of the equation.
-3.2x + 2.56 + x2 = 32.25 + 2.56

Reorder the terms:
2.56 + -3.2x + x2 = 32.25 + 2.56

Combine like terms: 32.25 + 2.56 = 34.81
2.56 + -3.2x + x2 = 34.81

Factor a perfect square on the left side:
(x + -1.6)(x + -1.6) = 34.81

Calculate the square root of the right side: 5.9

Break this problem into two subproblems by setting 
(x + -1.6) equal to 5.9 and -5.9.

Subproblem 1

x + -1.6 = 5.9 Simplifying x + -1.6 = 5.9 Reorder the terms: -1.6 + x = 5.9 Solving -1.6 + x = 5.9 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.6' to each side of the equation. -1.6 + 1.6 + x = 5.9 + 1.6 Combine like terms: -1.6 + 1.6 = 0.0 0.0 + x = 5.9 + 1.6 x = 5.9 + 1.6 Combine like terms: 5.9 + 1.6 = 7.5 x = 7.5 Simplifying x = 7.5

Subproblem 2

x + -1.6 = -5.9 Simplifying x + -1.6 = -5.9 Reorder the terms: -1.6 + x = -5.9 Solving -1.6 + x = -5.9 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.6' to each side of the equation. -1.6 + 1.6 + x = -5.9 + 1.6 Combine like terms: -1.6 + 1.6 = 0.0 0.0 + x = -5.9 + 1.6 x = -5.9 + 1.6 Combine like terms: -5.9 + 1.6 = -4.3 x = -4.3 Simplifying x = -4.3

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.5, -4.3}

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