(X-0.5)*(X+2)=0

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Solution for (X-0.5)*(X+2)=0 equation:


Simplifying
(X + -0.5)(X + 2) = 0

Reorder the terms:
(-0.5 + X)(X + 2) = 0

Reorder the terms:
(-0.5 + X)(2 + X) = 0

Multiply (-0.5 + X) * (2 + X)
(-0.5(2 + X) + X(2 + X)) = 0
((2 * -0.5 + X * -0.5) + X(2 + X)) = 0
((-1 + -0.5X) + X(2 + X)) = 0
(-1 + -0.5X + (2 * X + X * X)) = 0
(-1 + -0.5X + (2X + X2)) = 0

Combine like terms: -0.5X + 2X = 1.5X
(-1 + 1.5X + X2) = 0

Solving
-1 + 1.5X + X2 = 0

Solving for variable 'X'.

Begin completing the square.

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + 1.5X + 1 + X2 = 0 + 1

Reorder the terms:
-1 + 1 + 1.5X + X2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + 1.5X + X2 = 0 + 1
1.5X + X2 = 0 + 1

Combine like terms: 0 + 1 = 1
1.5X + X2 = 1

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 = 1 + 0.5625

Reorder the terms:
0.5625 + 1.5X + X2 = 1 + 0.5625

Combine like terms: 1 + 0.5625 = 1.5625
0.5625 + 1.5X + X2 = 1.5625

Factor a perfect square on the left side:
(X + 0.75)(X + 0.75) = 1.5625

Calculate the square root of the right side: 1.25

Break this problem into two subproblems by setting 
(X + 0.75) equal to 1.25 and -1.25.

Subproblem 1

X + 0.75 = 1.25 Simplifying X + 0.75 = 1.25 Reorder the terms: 0.75 + X = 1.25 Solving 0.75 + X = 1.25 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 = 1.25 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + X = 1.25 + -0.75 X = 1.25 + -0.75 Combine like terms: 1.25 + -0.75 = 0.5 X = 0.5 Simplifying X = 0.5

Subproblem 2

X + 0.75 = -1.25 Simplifying X + 0.75 = -1.25 Reorder the terms: 0.75 + X = -1.25 Solving 0.75 + X = -1.25 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 = -1.25 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + X = -1.25 + -0.75 X = -1.25 + -0.75 Combine like terms: -1.25 + -0.75 = -2 X = -2 Simplifying X = -2

Solution

The solution to the problem is based on the solutions from the subproblems. X = {0.5, -2}

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