2.5k^2-7.5k+1.25=0

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Solution for 2.5k^2-7.5k+1.25=0 equation:


Simplifying
2.5k2 + -7.5k + 1.25 = 0

Reorder the terms:
1.25 + -7.5k + 2.5k2 = 0

Solving
1.25 + -7.5k + 2.5k2 = 0

Solving for variable 'k'.

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

Divide each side by '2.5'.
0.5 + -3k + k2 = 0

Move the constant term to the right:

Add '-0.5' to each side of the equation.
0.5 + -3k + -0.5 + k2 = 0 + -0.5

Reorder the terms:
0.5 + -0.5 + -3k + k2 = 0 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
0.0 + -3k + k2 = 0 + -0.5
-3k + k2 = 0 + -0.5

Combine like terms: 0 + -0.5 = -0.5
-3k + k2 = -0.5

The k term is -3k.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3k + 2.25 + k2 = -0.5 + 2.25

Reorder the terms:
2.25 + -3k + k2 = -0.5 + 2.25

Combine like terms: -0.5 + 2.25 = 1.75
2.25 + -3k + k2 = 1.75

Factor a perfect square on the left side:
(k + -1.5)(k + -1.5) = 1.75

Calculate the square root of the right side: 1.322875656

Break this problem into two subproblems by setting 
(k + -1.5) equal to 1.322875656 and -1.322875656.

Subproblem 1

k + -1.5 = 1.322875656 Simplifying k + -1.5 = 1.322875656 Reorder the terms: -1.5 + k = 1.322875656 Solving -1.5 + k = 1.322875656 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + k = 1.322875656 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + k = 1.322875656 + 1.5 k = 1.322875656 + 1.5 Combine like terms: 1.322875656 + 1.5 = 2.822875656 k = 2.822875656 Simplifying k = 2.822875656

Subproblem 2

k + -1.5 = -1.322875656 Simplifying k + -1.5 = -1.322875656 Reorder the terms: -1.5 + k = -1.322875656 Solving -1.5 + k = -1.322875656 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + k = -1.322875656 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + k = -1.322875656 + 1.5 k = -1.322875656 + 1.5 Combine like terms: -1.322875656 + 1.5 = 0.177124344 k = 0.177124344 Simplifying k = 0.177124344

Solution

The solution to the problem is based on the solutions from the subproblems. k = {2.822875656, 0.177124344}

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