a(12+4.9a)=25

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Solution for a(12+4.9a)=25 equation:


Simplifying
a(12 + 4.9a) = 25
(12 * a + 4.9a * a) = 25
(12a + 4.9a2) = 25

Solving
12a + 4.9a2 = 25

Solving for variable 'a'.

Reorder the terms:
-25 + 12a + 4.9a2 = 25 + -25

Combine like terms: 25 + -25 = 0
-25 + 12a + 4.9a2 = 0

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

Divide each side by '4.9'.
-5.102040816 + 2.448979592a + a2 = 0

Move the constant term to the right:

Add '5.102040816' to each side of the equation.
-5.102040816 + 2.448979592a + 5.102040816 + a2 = 0 + 5.102040816

Reorder the terms:
-5.102040816 + 5.102040816 + 2.448979592a + a2 = 0 + 5.102040816

Combine like terms: -5.102040816 + 5.102040816 = 0.000000000
0.000000000 + 2.448979592a + a2 = 0 + 5.102040816
2.448979592a + a2 = 0 + 5.102040816

Combine like terms: 0 + 5.102040816 = 5.102040816
2.448979592a + a2 = 5.102040816

The a term is 2.448979592a.  Take half its coefficient (1.224489796).
Square it (1.499375261) and add it to both sides.

Add '1.499375261' to each side of the equation.
2.448979592a + 1.499375261 + a2 = 5.102040816 + 1.499375261

Reorder the terms:
1.499375261 + 2.448979592a + a2 = 5.102040816 + 1.499375261

Combine like terms: 5.102040816 + 1.499375261 = 6.601416077
1.499375261 + 2.448979592a + a2 = 6.601416077

Factor a perfect square on the left side:
(a + 1.224489796)(a + 1.224489796) = 6.601416077

Calculate the square root of the right side: 2.569322105

Break this problem into two subproblems by setting 
(a + 1.224489796) equal to 2.569322105 and -2.569322105.

Subproblem 1

a + 1.224489796 = 2.569322105 Simplifying a + 1.224489796 = 2.569322105 Reorder the terms: 1.224489796 + a = 2.569322105 Solving 1.224489796 + a = 2.569322105 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1.224489796' to each side of the equation. 1.224489796 + -1.224489796 + a = 2.569322105 + -1.224489796 Combine like terms: 1.224489796 + -1.224489796 = 0.000000000 0.000000000 + a = 2.569322105 + -1.224489796 a = 2.569322105 + -1.224489796 Combine like terms: 2.569322105 + -1.224489796 = 1.344832309 a = 1.344832309 Simplifying a = 1.344832309

Subproblem 2

a + 1.224489796 = -2.569322105 Simplifying a + 1.224489796 = -2.569322105 Reorder the terms: 1.224489796 + a = -2.569322105 Solving 1.224489796 + a = -2.569322105 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1.224489796' to each side of the equation. 1.224489796 + -1.224489796 + a = -2.569322105 + -1.224489796 Combine like terms: 1.224489796 + -1.224489796 = 0.000000000 0.000000000 + a = -2.569322105 + -1.224489796 a = -2.569322105 + -1.224489796 Combine like terms: -2.569322105 + -1.224489796 = -3.793811901 a = -3.793811901 Simplifying a = -3.793811901

Solution

The solution to the problem is based on the solutions from the subproblems. a = {1.344832309, -3.793811901}

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