0.5X^2-4X+3.5=0

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Solution for 0.5X^2-4X+3.5=0 equation:


Simplifying
0.5X2 + -4X + 3.5 = 0

Reorder the terms:
3.5 + -4X + 0.5X2 = 0

Solving
3.5 + -4X + 0.5X2 = 0

Solving for variable 'X'.

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

Divide each side by '0.5'.
7 + -8X + X2 = 0

Move the constant term to the right:

Add '-7' to each side of the equation.
7 + -8X + -7 + X2 = 0 + -7

Reorder the terms:
7 + -7 + -8X + X2 = 0 + -7

Combine like terms: 7 + -7 = 0
0 + -8X + X2 = 0 + -7
-8X + X2 = 0 + -7

Combine like terms: 0 + -7 = -7
-8X + X2 = -7

The X term is -8X.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8X + 16 + X2 = -7 + 16

Reorder the terms:
16 + -8X + X2 = -7 + 16

Combine like terms: -7 + 16 = 9
16 + -8X + X2 = 9

Factor a perfect square on the left side:
(X + -4)(X + -4) = 9

Calculate the square root of the right side: 3

Break this problem into two subproblems by setting 
(X + -4) equal to 3 and -3.

Subproblem 1

X + -4 = 3 Simplifying X + -4 = 3 Reorder the terms: -4 + X = 3 Solving -4 + X = 3 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + X = 3 + 4 Combine like terms: -4 + 4 = 0 0 + X = 3 + 4 X = 3 + 4 Combine like terms: 3 + 4 = 7 X = 7 Simplifying X = 7

Subproblem 2

X + -4 = -3 Simplifying X + -4 = -3 Reorder the terms: -4 + X = -3 Solving -4 + X = -3 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + X = -3 + 4 Combine like terms: -4 + 4 = 0 0 + X = -3 + 4 X = -3 + 4 Combine like terms: -3 + 4 = 1 X = 1 Simplifying X = 1

Solution

The solution to the problem is based on the solutions from the subproblems. X = {7, 1}

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