(a-3)(a+8)=24

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Solution for (a-3)(a+8)=24 equation:


Simplifying
(a + -3)(a + 8) = 24

Reorder the terms:
(-3 + a)(a + 8) = 24

Reorder the terms:
(-3 + a)(8 + a) = 24

Multiply (-3 + a) * (8 + a)
(-3(8 + a) + a(8 + a)) = 24
((8 * -3 + a * -3) + a(8 + a)) = 24
((-24 + -3a) + a(8 + a)) = 24
(-24 + -3a + (8 * a + a * a)) = 24
(-24 + -3a + (8a + a2)) = 24

Combine like terms: -3a + 8a = 5a
(-24 + 5a + a2) = 24

Solving
-24 + 5a + a2 = 24

Solving for variable 'a'.

Reorder the terms:
-24 + -24 + 5a + a2 = 24 + -24

Combine like terms: -24 + -24 = -48
-48 + 5a + a2 = 24 + -24

Combine like terms: 24 + -24 = 0
-48 + 5a + a2 = 0

Begin completing the square.

Move the constant term to the right:

Add '48' to each side of the equation.
-48 + 5a + 48 + a2 = 0 + 48

Reorder the terms:
-48 + 48 + 5a + a2 = 0 + 48

Combine like terms: -48 + 48 = 0
0 + 5a + a2 = 0 + 48
5a + a2 = 0 + 48

Combine like terms: 0 + 48 = 48
5a + a2 = 48

The a term is 5a.  Take half its coefficient (2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
5a + 6.25 + a2 = 48 + 6.25

Reorder the terms:
6.25 + 5a + a2 = 48 + 6.25

Combine like terms: 48 + 6.25 = 54.25
6.25 + 5a + a2 = 54.25

Factor a perfect square on the left side:
(a + 2.5)(a + 2.5) = 54.25

Calculate the square root of the right side: 7.365459931

Break this problem into two subproblems by setting 
(a + 2.5) equal to 7.365459931 and -7.365459931.

Subproblem 1

a + 2.5 = 7.365459931 Simplifying a + 2.5 = 7.365459931 Reorder the terms: 2.5 + a = 7.365459931 Solving 2.5 + a = 7.365459931 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + a = 7.365459931 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + a = 7.365459931 + -2.5 a = 7.365459931 + -2.5 Combine like terms: 7.365459931 + -2.5 = 4.865459931 a = 4.865459931 Simplifying a = 4.865459931

Subproblem 2

a + 2.5 = -7.365459931 Simplifying a + 2.5 = -7.365459931 Reorder the terms: 2.5 + a = -7.365459931 Solving 2.5 + a = -7.365459931 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + a = -7.365459931 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + a = -7.365459931 + -2.5 a = -7.365459931 + -2.5 Combine like terms: -7.365459931 + -2.5 = -9.865459931 a = -9.865459931 Simplifying a = -9.865459931

Solution

The solution to the problem is based on the solutions from the subproblems. a = {4.865459931, -9.865459931}

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