141=3a+a^2

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Solution for 141=3a+a^2 equation:


Simplifying
141 = 3a + a2

Solving
141 = 3a + a2

Solving for variable 'a'.

Reorder the terms:
141 + -3a + -1a2 = 3a + -3a + a2 + -1a2

Combine like terms: 3a + -3a = 0
141 + -3a + -1a2 = 0 + a2 + -1a2
141 + -3a + -1a2 = a2 + -1a2

Combine like terms: a2 + -1a2 = 0
141 + -3a + -1a2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-141 + 3a + a2 = 0

Move the constant term to the right:

Add '141' to each side of the equation.
-141 + 3a + 141 + a2 = 0 + 141

Reorder the terms:
-141 + 141 + 3a + a2 = 0 + 141

Combine like terms: -141 + 141 = 0
0 + 3a + a2 = 0 + 141
3a + a2 = 0 + 141

Combine like terms: 0 + 141 = 141
3a + a2 = 141

The a term is 3a.  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.
3a + 2.25 + a2 = 141 + 2.25

Reorder the terms:
2.25 + 3a + a2 = 141 + 2.25

Combine like terms: 141 + 2.25 = 143.25
2.25 + 3a + a2 = 143.25

Factor a perfect square on the left side:
(a + 1.5)(a + 1.5) = 143.25

Calculate the square root of the right side: 11.968709204

Break this problem into two subproblems by setting 
(a + 1.5) equal to 11.968709204 and -11.968709204.

Subproblem 1

a + 1.5 = 11.968709204 Simplifying a + 1.5 = 11.968709204 Reorder the terms: 1.5 + a = 11.968709204 Solving 1.5 + a = 11.968709204 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + a = 11.968709204 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + a = 11.968709204 + -1.5 a = 11.968709204 + -1.5 Combine like terms: 11.968709204 + -1.5 = 10.468709204 a = 10.468709204 Simplifying a = 10.468709204

Subproblem 2

a + 1.5 = -11.968709204 Simplifying a + 1.5 = -11.968709204 Reorder the terms: 1.5 + a = -11.968709204 Solving 1.5 + a = -11.968709204 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + a = -11.968709204 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + a = -11.968709204 + -1.5 a = -11.968709204 + -1.5 Combine like terms: -11.968709204 + -1.5 = -13.468709204 a = -13.468709204 Simplifying a = -13.468709204

Solution

The solution to the problem is based on the solutions from the subproblems. a = {10.468709204, -13.468709204}

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