3x^2-2ax-2a^2=0

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Solution for 3x^2-2ax-2a^2=0 equation:


Simplifying
3x2 + -2ax + -2a2 = 0

Reorder the terms:
-2ax + -2a2 + 3x2 = 0

Solving
-2ax + -2a2 + 3x2 = 0

Solving for variable 'a'.

Begin completing the square.  Divide all terms by
-2 the coefficient of the squared term: 

Divide each side by '-2'.
ax + a2 + -1.5x2 = 0

Move the constant term to the right:

Add '1.5x2' to each side of the equation.
ax + a2 + -1.5x2 + 1.5x2 = 0 + 1.5x2

Combine like terms: -1.5x2 + 1.5x2 = 0.0
ax + a2 + 0.0 = 0 + 1.5x2
ax + a2 = 0 + 1.5x2
Remove the zero:
ax + a2 = 1.5x2

The a term is ax.  Take half its coefficient (0.5x).
Square it (0.25x2) and add it to both sides.

Add '0.25x2' to each side of the equation.
x2 + a2 + 0.25x2 = 1.5x2 + 0.25x2

Reorder the terms:
a2 + x2 + 0.25x2 = 1.5x2 + 0.25x2

Combine like terms: x2 + 0.25x2 = 1.25x2
a2 + 1.25x2 = 1.5x2 + 0.25x2

Combine like terms: 1.5x2 + 0.25x2 = 1.75x2
a2 + 1.25x2 = 1.75x2

Factor a perfect square on the left side:
(a + 0.5x)(a + 0.5x) = 1.75x2

Calculate the square root of the right side: 1.322875656x

Break this problem into two subproblems by setting 
(a + 0.5x) equal to 1.322875656x and -1.322875656x.

Subproblem 1

a + 0.5x = 1.322875656x Simplifying a + 0.5x = 1.322875656x Solving a + 0.5x = 1.322875656x Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-0.5x' to each side of the equation. a + 0.5x + -0.5x = 1.322875656x + -0.5x Combine like terms: 0.5x + -0.5x = 0.0 a + 0.0 = 1.322875656x + -0.5x a = 1.322875656x + -0.5x Combine like terms: 1.322875656x + -0.5x = 0.822875656x a = 0.822875656x Simplifying a = 0.822875656x

Subproblem 2

a + 0.5x = -1.322875656x Simplifying a + 0.5x = -1.322875656x Solving a + 0.5x = -1.322875656x Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-0.5x' to each side of the equation. a + 0.5x + -0.5x = -1.322875656x + -0.5x Combine like terms: 0.5x + -0.5x = 0.0 a + 0.0 = -1.322875656x + -0.5x a = -1.322875656x + -0.5x Combine like terms: -1.322875656x + -0.5x = -1.822875656x a = -1.822875656x Simplifying a = -1.822875656x

Solution

The solution to the problem is based on the solutions from the subproblems. a = {0.822875656x, -1.822875656x}

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