10a^2-25a+4=0

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Solution for 10a^2-25a+4=0 equation:


Simplifying
10a2 + -25a + 4 = 0

Reorder the terms:
4 + -25a + 10a2 = 0

Solving
4 + -25a + 10a2 = 0

Solving for variable 'a'.

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

Divide each side by '10'.
0.4 + -2.5a + a2 = 0

Move the constant term to the right:

Add '-0.4' to each side of the equation.
0.4 + -2.5a + -0.4 + a2 = 0 + -0.4

Reorder the terms:
0.4 + -0.4 + -2.5a + a2 = 0 + -0.4

Combine like terms: 0.4 + -0.4 = 0.0
0.0 + -2.5a + a2 = 0 + -0.4
-2.5a + a2 = 0 + -0.4

Combine like terms: 0 + -0.4 = -0.4
-2.5a + a2 = -0.4

The a term is -2.5a.  Take half its coefficient (-1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
-2.5a + 1.5625 + a2 = -0.4 + 1.5625

Reorder the terms:
1.5625 + -2.5a + a2 = -0.4 + 1.5625

Combine like terms: -0.4 + 1.5625 = 1.1625
1.5625 + -2.5a + a2 = 1.1625

Factor a perfect square on the left side:
(a + -1.25)(a + -1.25) = 1.1625

Calculate the square root of the right side: 1.078192933

Break this problem into two subproblems by setting 
(a + -1.25) equal to 1.078192933 and -1.078192933.

Subproblem 1

a + -1.25 = 1.078192933 Simplifying a + -1.25 = 1.078192933 Reorder the terms: -1.25 + a = 1.078192933 Solving -1.25 + a = 1.078192933 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + a = 1.078192933 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + a = 1.078192933 + 1.25 a = 1.078192933 + 1.25 Combine like terms: 1.078192933 + 1.25 = 2.328192933 a = 2.328192933 Simplifying a = 2.328192933

Subproblem 2

a + -1.25 = -1.078192933 Simplifying a + -1.25 = -1.078192933 Reorder the terms: -1.25 + a = -1.078192933 Solving -1.25 + a = -1.078192933 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + a = -1.078192933 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + a = -1.078192933 + 1.25 a = -1.078192933 + 1.25 Combine like terms: -1.078192933 + 1.25 = 0.171807067 a = 0.171807067 Simplifying a = 0.171807067

Solution

The solution to the problem is based on the solutions from the subproblems. a = {2.328192933, 0.171807067}

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