(a-1)(a+2)=14

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Solution for (a-1)(a+2)=14 equation:


Simplifying
(a + -1)(a + 2) = 14

Reorder the terms:
(-1 + a)(a + 2) = 14

Reorder the terms:
(-1 + a)(2 + a) = 14

Multiply (-1 + a) * (2 + a)
(-1(2 + a) + a(2 + a)) = 14
((2 * -1 + a * -1) + a(2 + a)) = 14
((-2 + -1a) + a(2 + a)) = 14
(-2 + -1a + (2 * a + a * a)) = 14
(-2 + -1a + (2a + a2)) = 14

Combine like terms: -1a + 2a = 1a
(-2 + 1a + a2) = 14

Solving
-2 + 1a + a2 = 14

Solving for variable 'a'.

Reorder the terms:
-2 + -14 + 1a + a2 = 14 + -14

Combine like terms: -2 + -14 = -16
-16 + 1a + a2 = 14 + -14

Combine like terms: 14 + -14 = 0
-16 + 1a + a2 = 0

Begin completing the square.

Move the constant term to the right:

Add '16' to each side of the equation.
-16 + 1a + 16 + a2 = 0 + 16

Reorder the terms:
-16 + 16 + 1a + a2 = 0 + 16

Combine like terms: -16 + 16 = 0
0 + 1a + a2 = 0 + 16
1a + a2 = 0 + 16

Combine like terms: 0 + 16 = 16
1a + a2 = 16

The a term is 1a.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
a + 0.25 + a2 = 16 + 0.25

Reorder the terms:
0.25 + a + a2 = 16 + 0.25

Combine like terms: 16 + 0.25 = 16.25
0.25 + a + a2 = 16.25

Factor a perfect square on the left side:
(a + 0.5)(a + 0.5) = 16.25

Calculate the square root of the right side: 4.031128874

Break this problem into two subproblems by setting 
(a + 0.5) equal to 4.031128874 and -4.031128874.

Subproblem 1

a + 0.5 = 4.031128874 Simplifying a + 0.5 = 4.031128874 Reorder the terms: 0.5 + a = 4.031128874 Solving 0.5 + a = 4.031128874 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + a = 4.031128874 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + a = 4.031128874 + -0.5 a = 4.031128874 + -0.5 Combine like terms: 4.031128874 + -0.5 = 3.531128874 a = 3.531128874 Simplifying a = 3.531128874

Subproblem 2

a + 0.5 = -4.031128874 Simplifying a + 0.5 = -4.031128874 Reorder the terms: 0.5 + a = -4.031128874 Solving 0.5 + a = -4.031128874 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + a = -4.031128874 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + a = -4.031128874 + -0.5 a = -4.031128874 + -0.5 Combine like terms: -4.031128874 + -0.5 = -4.531128874 a = -4.531128874 Simplifying a = -4.531128874

Solution

The solution to the problem is based on the solutions from the subproblems. a = {3.531128874, -4.531128874}

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