3a(a+4)-2+7=

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Solution for 3a(a+4)-2+7= equation:


Simplifying
3a(a + 4) + -2 + 7 = 0

Reorder the terms:
3a(4 + a) + -2 + 7 = 0
(4 * 3a + a * 3a) + -2 + 7 = 0
(12a + 3a2) + -2 + 7 = 0

Reorder the terms:
-2 + 7 + 12a + 3a2 = 0

Combine like terms: -2 + 7 = 5
5 + 12a + 3a2 = 0

Solving
5 + 12a + 3a2 = 0

Solving for variable 'a'.

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

Divide each side by '3'.
1.666666667 + 4a + a2 = 0

Move the constant term to the right:

Add '-1.666666667' to each side of the equation.
1.666666667 + 4a + -1.666666667 + a2 = 0 + -1.666666667

Reorder the terms:
1.666666667 + -1.666666667 + 4a + a2 = 0 + -1.666666667

Combine like terms: 1.666666667 + -1.666666667 = 0.000000000
0.000000000 + 4a + a2 = 0 + -1.666666667
4a + a2 = 0 + -1.666666667

Combine like terms: 0 + -1.666666667 = -1.666666667
4a + a2 = -1.666666667

The a term is 4a.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4a + 4 + a2 = -1.666666667 + 4

Reorder the terms:
4 + 4a + a2 = -1.666666667 + 4

Combine like terms: -1.666666667 + 4 = 2.333333333
4 + 4a + a2 = 2.333333333

Factor a perfect square on the left side:
(a + 2)(a + 2) = 2.333333333

Calculate the square root of the right side: 1.527525232

Break this problem into two subproblems by setting 
(a + 2) equal to 1.527525232 and -1.527525232.

Subproblem 1

a + 2 = 1.527525232 Simplifying a + 2 = 1.527525232 Reorder the terms: 2 + a = 1.527525232 Solving 2 + a = 1.527525232 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + a = 1.527525232 + -2 Combine like terms: 2 + -2 = 0 0 + a = 1.527525232 + -2 a = 1.527525232 + -2 Combine like terms: 1.527525232 + -2 = -0.472474768 a = -0.472474768 Simplifying a = -0.472474768

Subproblem 2

a + 2 = -1.527525232 Simplifying a + 2 = -1.527525232 Reorder the terms: 2 + a = -1.527525232 Solving 2 + a = -1.527525232 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + a = -1.527525232 + -2 Combine like terms: 2 + -2 = 0 0 + a = -1.527525232 + -2 a = -1.527525232 + -2 Combine like terms: -1.527525232 + -2 = -3.527525232 a = -3.527525232 Simplifying a = -3.527525232

Solution

The solution to the problem is based on the solutions from the subproblems. a = {-0.472474768, -3.527525232}

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