5x^2-3x-4=6

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Solution for 5x^2-3x-4=6 equation:


Simplifying
5x2 + -3x + -4 = 6

Reorder the terms:
-4 + -3x + 5x2 = 6

Solving
-4 + -3x + 5x2 = 6

Solving for variable 'x'.

Reorder the terms:
-4 + -6 + -3x + 5x2 = 6 + -6

Combine like terms: -4 + -6 = -10
-10 + -3x + 5x2 = 6 + -6

Combine like terms: 6 + -6 = 0
-10 + -3x + 5x2 = 0

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

Divide each side by '5'.
-2 + -0.6x + x2 = 0

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + -0.6x + 2 + x2 = 0 + 2

Reorder the terms:
-2 + 2 + -0.6x + x2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + -0.6x + x2 = 0 + 2
-0.6x + x2 = 0 + 2

Combine like terms: 0 + 2 = 2
-0.6x + x2 = 2

The x term is -0.6x.  Take half its coefficient (-0.3).
Square it (0.09) and add it to both sides.

Add '0.09' to each side of the equation.
-0.6x + 0.09 + x2 = 2 + 0.09

Reorder the terms:
0.09 + -0.6x + x2 = 2 + 0.09

Combine like terms: 2 + 0.09 = 2.09
0.09 + -0.6x + x2 = 2.09

Factor a perfect square on the left side:
(x + -0.3)(x + -0.3) = 2.09

Calculate the square root of the right side: 1.445683229

Break this problem into two subproblems by setting 
(x + -0.3) equal to 1.445683229 and -1.445683229.

Subproblem 1

x + -0.3 = 1.445683229 Simplifying x + -0.3 = 1.445683229 Reorder the terms: -0.3 + x = 1.445683229 Solving -0.3 + x = 1.445683229 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3' to each side of the equation. -0.3 + 0.3 + x = 1.445683229 + 0.3 Combine like terms: -0.3 + 0.3 = 0.0 0.0 + x = 1.445683229 + 0.3 x = 1.445683229 + 0.3 Combine like terms: 1.445683229 + 0.3 = 1.745683229 x = 1.745683229 Simplifying x = 1.745683229

Subproblem 2

x + -0.3 = -1.445683229 Simplifying x + -0.3 = -1.445683229 Reorder the terms: -0.3 + x = -1.445683229 Solving -0.3 + x = -1.445683229 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3' to each side of the equation. -0.3 + 0.3 + x = -1.445683229 + 0.3 Combine like terms: -0.3 + 0.3 = 0.0 0.0 + x = -1.445683229 + 0.3 x = -1.445683229 + 0.3 Combine like terms: -1.445683229 + 0.3 = -1.145683229 x = -1.145683229 Simplifying x = -1.145683229

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.745683229, -1.145683229}

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