(a-4)(a+10)=-17

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Solution for (a-4)(a+10)=-17 equation:


Simplifying
(a + -4)(a + 10) = -17

Reorder the terms:
(-4 + a)(a + 10) = -17

Reorder the terms:
(-4 + a)(10 + a) = -17

Multiply (-4 + a) * (10 + a)
(-4(10 + a) + a(10 + a)) = -17
((10 * -4 + a * -4) + a(10 + a)) = -17
((-40 + -4a) + a(10 + a)) = -17
(-40 + -4a + (10 * a + a * a)) = -17
(-40 + -4a + (10a + a2)) = -17

Combine like terms: -4a + 10a = 6a
(-40 + 6a + a2) = -17

Solving
-40 + 6a + a2 = -17

Solving for variable 'a'.

Reorder the terms:
-40 + 17 + 6a + a2 = -17 + 17

Combine like terms: -40 + 17 = -23
-23 + 6a + a2 = -17 + 17

Combine like terms: -17 + 17 = 0
-23 + 6a + a2 = 0

Begin completing the square.

Move the constant term to the right:

Add '23' to each side of the equation.
-23 + 6a + 23 + a2 = 0 + 23

Reorder the terms:
-23 + 23 + 6a + a2 = 0 + 23

Combine like terms: -23 + 23 = 0
0 + 6a + a2 = 0 + 23
6a + a2 = 0 + 23

Combine like terms: 0 + 23 = 23
6a + a2 = 23

The a term is 6a.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6a + 9 + a2 = 23 + 9

Reorder the terms:
9 + 6a + a2 = 23 + 9

Combine like terms: 23 + 9 = 32
9 + 6a + a2 = 32

Factor a perfect square on the left side:
(a + 3)(a + 3) = 32

Calculate the square root of the right side: 5.656854249

Break this problem into two subproblems by setting 
(a + 3) equal to 5.656854249 and -5.656854249.

Subproblem 1

a + 3 = 5.656854249 Simplifying a + 3 = 5.656854249 Reorder the terms: 3 + a = 5.656854249 Solving 3 + a = 5.656854249 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + a = 5.656854249 + -3 Combine like terms: 3 + -3 = 0 0 + a = 5.656854249 + -3 a = 5.656854249 + -3 Combine like terms: 5.656854249 + -3 = 2.656854249 a = 2.656854249 Simplifying a = 2.656854249

Subproblem 2

a + 3 = -5.656854249 Simplifying a + 3 = -5.656854249 Reorder the terms: 3 + a = -5.656854249 Solving 3 + a = -5.656854249 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + a = -5.656854249 + -3 Combine like terms: 3 + -3 = 0 0 + a = -5.656854249 + -3 a = -5.656854249 + -3 Combine like terms: -5.656854249 + -3 = -8.656854249 a = -8.656854249 Simplifying a = -8.656854249

Solution

The solution to the problem is based on the solutions from the subproblems. a = {2.656854249, -8.656854249}

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