a^2+2a-40=0

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Solution for a^2+2a-40=0 equation:


Simplifying
a2 + 2a + -40 = 0

Reorder the terms:
-40 + 2a + a2 = 0

Solving
-40 + 2a + a2 = 0

Solving for variable 'a'.

Begin completing the square.

Move the constant term to the right:

Add '40' to each side of the equation.
-40 + 2a + 40 + a2 = 0 + 40

Reorder the terms:
-40 + 40 + 2a + a2 = 0 + 40

Combine like terms: -40 + 40 = 0
0 + 2a + a2 = 0 + 40
2a + a2 = 0 + 40

Combine like terms: 0 + 40 = 40
2a + a2 = 40

The a term is 2a.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2a + 1 + a2 = 40 + 1

Reorder the terms:
1 + 2a + a2 = 40 + 1

Combine like terms: 40 + 1 = 41
1 + 2a + a2 = 41

Factor a perfect square on the left side:
(a + 1)(a + 1) = 41

Calculate the square root of the right side: 6.403124237

Break this problem into two subproblems by setting 
(a + 1) equal to 6.403124237 and -6.403124237.

Subproblem 1

a + 1 = 6.403124237 Simplifying a + 1 = 6.403124237 Reorder the terms: 1 + a = 6.403124237 Solving 1 + a = 6.403124237 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + a = 6.403124237 + -1 Combine like terms: 1 + -1 = 0 0 + a = 6.403124237 + -1 a = 6.403124237 + -1 Combine like terms: 6.403124237 + -1 = 5.403124237 a = 5.403124237 Simplifying a = 5.403124237

Subproblem 2

a + 1 = -6.403124237 Simplifying a + 1 = -6.403124237 Reorder the terms: 1 + a = -6.403124237 Solving 1 + a = -6.403124237 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + a = -6.403124237 + -1 Combine like terms: 1 + -1 = 0 0 + a = -6.403124237 + -1 a = -6.403124237 + -1 Combine like terms: -6.403124237 + -1 = -7.403124237 a = -7.403124237 Simplifying a = -7.403124237

Solution

The solution to the problem is based on the solutions from the subproblems. a = {5.403124237, -7.403124237}

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