5(a+6)-3a(a+4)=

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Solution for 5(a+6)-3a(a+4)= equation:


Simplifying
5(a + 6) + -3a(a + 4) = 0

Reorder the terms:
5(6 + a) + -3a(a + 4) = 0
(6 * 5 + a * 5) + -3a(a + 4) = 0
(30 + 5a) + -3a(a + 4) = 0

Reorder the terms:
30 + 5a + -3a(4 + a) = 0
30 + 5a + (4 * -3a + a * -3a) = 0
30 + 5a + (-12a + -3a2) = 0

Combine like terms: 5a + -12a = -7a
30 + -7a + -3a2 = 0

Solving
30 + -7a + -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'.
-10 + 2.333333333a + a2 = 0

Move the constant term to the right:

Add '10' to each side of the equation.
-10 + 2.333333333a + 10 + a2 = 0 + 10

Reorder the terms:
-10 + 10 + 2.333333333a + a2 = 0 + 10

Combine like terms: -10 + 10 = 0
0 + 2.333333333a + a2 = 0 + 10
2.333333333a + a2 = 0 + 10

Combine like terms: 0 + 10 = 10
2.333333333a + a2 = 10

The a term is 2.333333333a.  Take half its coefficient (1.166666667).
Square it (1.361111112) and add it to both sides.

Add '1.361111112' to each side of the equation.
2.333333333a + 1.361111112 + a2 = 10 + 1.361111112

Reorder the terms:
1.361111112 + 2.333333333a + a2 = 10 + 1.361111112

Combine like terms: 10 + 1.361111112 = 11.361111112
1.361111112 + 2.333333333a + a2 = 11.361111112

Factor a perfect square on the left side:
(a + 1.166666667)(a + 1.166666667) = 11.361111112

Calculate the square root of the right side: 3.370624736

Break this problem into two subproblems by setting 
(a + 1.166666667) equal to 3.370624736 and -3.370624736.

Subproblem 1

a + 1.166666667 = 3.370624736 Simplifying a + 1.166666667 = 3.370624736 Reorder the terms: 1.166666667 + a = 3.370624736 Solving 1.166666667 + a = 3.370624736 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1.166666667' to each side of the equation. 1.166666667 + -1.166666667 + a = 3.370624736 + -1.166666667 Combine like terms: 1.166666667 + -1.166666667 = 0.000000000 0.000000000 + a = 3.370624736 + -1.166666667 a = 3.370624736 + -1.166666667 Combine like terms: 3.370624736 + -1.166666667 = 2.203958069 a = 2.203958069 Simplifying a = 2.203958069

Subproblem 2

a + 1.166666667 = -3.370624736 Simplifying a + 1.166666667 = -3.370624736 Reorder the terms: 1.166666667 + a = -3.370624736 Solving 1.166666667 + a = -3.370624736 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1.166666667' to each side of the equation. 1.166666667 + -1.166666667 + a = -3.370624736 + -1.166666667 Combine like terms: 1.166666667 + -1.166666667 = 0.000000000 0.000000000 + a = -3.370624736 + -1.166666667 a = -3.370624736 + -1.166666667 Combine like terms: -3.370624736 + -1.166666667 = -4.537291403 a = -4.537291403 Simplifying a = -4.537291403

Solution

The solution to the problem is based on the solutions from the subproblems. a = {2.203958069, -4.537291403}

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