a^2+8a-3=0

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Solution for a^2+8a-3=0 equation:


Simplifying
a2 + 8a + -3 = 0

Reorder the terms:
-3 + 8a + a2 = 0

Solving
-3 + 8a + a2 = 0

Solving for variable 'a'.

Begin completing the square.

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + 8a + 3 + a2 = 0 + 3

Reorder the terms:
-3 + 3 + 8a + a2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + 8a + a2 = 0 + 3
8a + a2 = 0 + 3

Combine like terms: 0 + 3 = 3
8a + a2 = 3

The a term is 8a.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8a + 16 + a2 = 3 + 16

Reorder the terms:
16 + 8a + a2 = 3 + 16

Combine like terms: 3 + 16 = 19
16 + 8a + a2 = 19

Factor a perfect square on the left side:
(a + 4)(a + 4) = 19

Calculate the square root of the right side: 4.358898944

Break this problem into two subproblems by setting 
(a + 4) equal to 4.358898944 and -4.358898944.

Subproblem 1

a + 4 = 4.358898944 Simplifying a + 4 = 4.358898944 Reorder the terms: 4 + a = 4.358898944 Solving 4 + a = 4.358898944 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + a = 4.358898944 + -4 Combine like terms: 4 + -4 = 0 0 + a = 4.358898944 + -4 a = 4.358898944 + -4 Combine like terms: 4.358898944 + -4 = 0.358898944 a = 0.358898944 Simplifying a = 0.358898944

Subproblem 2

a + 4 = -4.358898944 Simplifying a + 4 = -4.358898944 Reorder the terms: 4 + a = -4.358898944 Solving 4 + a = -4.358898944 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + a = -4.358898944 + -4 Combine like terms: 4 + -4 = 0 0 + a = -4.358898944 + -4 a = -4.358898944 + -4 Combine like terms: -4.358898944 + -4 = -8.358898944 a = -8.358898944 Simplifying a = -8.358898944

Solution

The solution to the problem is based on the solutions from the subproblems. a = {0.358898944, -8.358898944}

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