0.2x^2-1.75x+1.2=0

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Solution for 0.2x^2-1.75x+1.2=0 equation:


Simplifying
0.2x2 + -1.75x + 1.2 = 0

Reorder the terms:
1.2 + -1.75x + 0.2x2 = 0

Solving
1.2 + -1.75x + 0.2x2 = 0

Solving for variable 'x'.

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

Divide each side by '0.2'.
6 + -8.75x + x2 = 0

Move the constant term to the right:

Add '-6' to each side of the equation.
6 + -8.75x + -6 + x2 = 0 + -6

Reorder the terms:
6 + -6 + -8.75x + x2 = 0 + -6

Combine like terms: 6 + -6 = 0
0 + -8.75x + x2 = 0 + -6
-8.75x + x2 = 0 + -6

Combine like terms: 0 + -6 = -6
-8.75x + x2 = -6

The x term is -8.75x.  Take half its coefficient (-4.375).
Square it (19.140625) and add it to both sides.

Add '19.140625' to each side of the equation.
-8.75x + 19.140625 + x2 = -6 + 19.140625

Reorder the terms:
19.140625 + -8.75x + x2 = -6 + 19.140625

Combine like terms: -6 + 19.140625 = 13.140625
19.140625 + -8.75x + x2 = 13.140625

Factor a perfect square on the left side:
(x + -4.375)(x + -4.375) = 13.140625

Calculate the square root of the right side: 3.625

Break this problem into two subproblems by setting 
(x + -4.375) equal to 3.625 and -3.625.

Subproblem 1

x + -4.375 = 3.625 Simplifying x + -4.375 = 3.625 Reorder the terms: -4.375 + x = 3.625 Solving -4.375 + x = 3.625 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.375' to each side of the equation. -4.375 + 4.375 + x = 3.625 + 4.375 Combine like terms: -4.375 + 4.375 = 0.000 0.000 + x = 3.625 + 4.375 x = 3.625 + 4.375 Combine like terms: 3.625 + 4.375 = 8 x = 8 Simplifying x = 8

Subproblem 2

x + -4.375 = -3.625 Simplifying x + -4.375 = -3.625 Reorder the terms: -4.375 + x = -3.625 Solving -4.375 + x = -3.625 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.375' to each side of the equation. -4.375 + 4.375 + x = -3.625 + 4.375 Combine like terms: -4.375 + 4.375 = 0.000 0.000 + x = -3.625 + 4.375 x = -3.625 + 4.375 Combine like terms: -3.625 + 4.375 = 0.75 x = 0.75 Simplifying x = 0.75

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8, 0.75}

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