4a^2+10a+6.25=0

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Solution for 4a^2+10a+6.25=0 equation:


Simplifying
4a2 + 10a + 6.25 = 0

Reorder the terms:
6.25 + 10a + 4a2 = 0

Solving
6.25 + 10a + 4a2 = 0

Solving for variable 'a'.

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

Divide each side by '4'.
1.5625 + 2.5a + a2 = 0

Move the constant term to the right:

Add '-1.5625' to each side of the equation.
1.5625 + 2.5a + -1.5625 + a2 = 0 + -1.5625

Reorder the terms:
1.5625 + -1.5625 + 2.5a + a2 = 0 + -1.5625

Combine like terms: 1.5625 + -1.5625 = 0.0000
0.0000 + 2.5a + a2 = 0 + -1.5625
2.5a + a2 = 0 + -1.5625

Combine like terms: 0 + -1.5625 = -1.5625
2.5a + a2 = -1.5625

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 = -1.5625 + 1.5625

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

Combine like terms: -1.5625 + 1.5625 = 0.0000
1.5625 + 2.5a + a2 = 0.0000

Factor a perfect square on the left side:
(a + 1.25)(a + 1.25) = 0.0000

Calculate the square root of the right side: 0.0000

Break this problem into two subproblems by setting 
(a + 1.25) equal to 0.0000 and 0.0000.

Subproblem 1

a + 1.25 = 0.0000 Simplifying a + 1.25 = 0.0000 Reorder the terms: 1.25 + a = 0.0000 Solving 1.25 + a = 0.0000 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 = 0.0000 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + a = 0.0000 + -1.25 a = 0.0000 + -1.25 Combine like terms: 0.0000 + -1.25 = -1.25 a = -1.25 Simplifying a = -1.25

Subproblem 2

a + 1.25 = 0.0000 Simplifying a + 1.25 = 0.0000 Reorder the terms: 1.25 + a = 0.0000 Solving 1.25 + a = 0.0000 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 = 0.0000 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + a = 0.0000 + -1.25 a = 0.0000 + -1.25 Combine like terms: 0.0000 + -1.25 = -1.25 a = -1.25 Simplifying a = -1.25

Solution

The solution to the problem is based on the solutions from the subproblems. a = {-1.25, -1.25}

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