18+11a=-5a(-7a-3)

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Solution for 18+11a=-5a(-7a-3) equation:


Simplifying
18 + 11a = -5a(-7a + -3)

Reorder the terms:
18 + 11a = -5a(-3 + -7a)
18 + 11a = (-3 * -5a + -7a * -5a)
18 + 11a = (15a + 35a2)

Solving
18 + 11a = 15a + 35a2

Solving for variable 'a'.

Combine like terms: 11a + -15a = -4a
18 + -4a + -35a2 = 15a + 35a2 + -15a + -35a2

Reorder the terms:
18 + -4a + -35a2 = 15a + -15a + 35a2 + -35a2

Combine like terms: 15a + -15a = 0
18 + -4a + -35a2 = 0 + 35a2 + -35a2
18 + -4a + -35a2 = 35a2 + -35a2

Combine like terms: 35a2 + -35a2 = 0
18 + -4a + -35a2 = 0

Begin completing the square.  Divide all terms by
-35 the coefficient of the squared term: 

Divide each side by '-35'.
-0.5142857143 + 0.1142857143a + a2 = 0

Move the constant term to the right:

Add '0.5142857143' to each side of the equation.
-0.5142857143 + 0.1142857143a + 0.5142857143 + a2 = 0 + 0.5142857143

Reorder the terms:
-0.5142857143 + 0.5142857143 + 0.1142857143a + a2 = 0 + 0.5142857143

Combine like terms: -0.5142857143 + 0.5142857143 = 0.0000000000
0.0000000000 + 0.1142857143a + a2 = 0 + 0.5142857143
0.1142857143a + a2 = 0 + 0.5142857143

Combine like terms: 0 + 0.5142857143 = 0.5142857143
0.1142857143a + a2 = 0.5142857143

The a term is 0.1142857143a.  Take half its coefficient (0.05714285715).
Square it (0.003265306123) and add it to both sides.

Add '0.003265306123' to each side of the equation.
0.1142857143a + 0.003265306123 + a2 = 0.5142857143 + 0.003265306123

Reorder the terms:
0.003265306123 + 0.1142857143a + a2 = 0.5142857143 + 0.003265306123

Combine like terms: 0.5142857143 + 0.003265306123 = 0.517551020423
0.003265306123 + 0.1142857143a + a2 = 0.517551020423

Factor a perfect square on the left side:
(a + 0.05714285715)(a + 0.05714285715) = 0.517551020423

Calculate the square root of the right side: 0.719410189

Break this problem into two subproblems by setting 
(a + 0.05714285715) equal to 0.719410189 and -0.719410189.

Subproblem 1

a + 0.05714285715 = 0.719410189 Simplifying a + 0.05714285715 = 0.719410189 Reorder the terms: 0.05714285715 + a = 0.719410189 Solving 0.05714285715 + a = 0.719410189 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-0.05714285715' to each side of the equation. 0.05714285715 + -0.05714285715 + a = 0.719410189 + -0.05714285715 Combine like terms: 0.05714285715 + -0.05714285715 = 0.00000000000 0.00000000000 + a = 0.719410189 + -0.05714285715 a = 0.719410189 + -0.05714285715 Combine like terms: 0.719410189 + -0.05714285715 = 0.66226733185 a = 0.66226733185 Simplifying a = 0.66226733185

Subproblem 2

a + 0.05714285715 = -0.719410189 Simplifying a + 0.05714285715 = -0.719410189 Reorder the terms: 0.05714285715 + a = -0.719410189 Solving 0.05714285715 + a = -0.719410189 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-0.05714285715' to each side of the equation. 0.05714285715 + -0.05714285715 + a = -0.719410189 + -0.05714285715 Combine like terms: 0.05714285715 + -0.05714285715 = 0.00000000000 0.00000000000 + a = -0.719410189 + -0.05714285715 a = -0.719410189 + -0.05714285715 Combine like terms: -0.719410189 + -0.05714285715 = -0.77655304615 a = -0.77655304615 Simplifying a = -0.77655304615

Solution

The solution to the problem is based on the solutions from the subproblems. a = {0.66226733185, -0.77655304615}

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