5x^2-11x-4=0

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Solution for 5x^2-11x-4=0 equation:


Simplifying
5x2 + -11x + -4 = 0

Reorder the terms:
-4 + -11x + 5x2 = 0

Solving
-4 + -11x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
-0.8 + -2.2x + x2 = 0

Move the constant term to the right:

Add '0.8' to each side of the equation.
-0.8 + -2.2x + 0.8 + x2 = 0 + 0.8

Reorder the terms:
-0.8 + 0.8 + -2.2x + x2 = 0 + 0.8

Combine like terms: -0.8 + 0.8 = 0.0
0.0 + -2.2x + x2 = 0 + 0.8
-2.2x + x2 = 0 + 0.8

Combine like terms: 0 + 0.8 = 0.8
-2.2x + x2 = 0.8

The x term is -2.2x.  Take half its coefficient (-1.1).
Square it (1.21) and add it to both sides.

Add '1.21' to each side of the equation.
-2.2x + 1.21 + x2 = 0.8 + 1.21

Reorder the terms:
1.21 + -2.2x + x2 = 0.8 + 1.21

Combine like terms: 0.8 + 1.21 = 2.01
1.21 + -2.2x + x2 = 2.01

Factor a perfect square on the left side:
(x + -1.1)(x + -1.1) = 2.01

Calculate the square root of the right side: 1.417744688

Break this problem into two subproblems by setting 
(x + -1.1) equal to 1.417744688 and -1.417744688.

Subproblem 1

x + -1.1 = 1.417744688 Simplifying x + -1.1 = 1.417744688 Reorder the terms: -1.1 + x = 1.417744688 Solving -1.1 + x = 1.417744688 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.1' to each side of the equation. -1.1 + 1.1 + x = 1.417744688 + 1.1 Combine like terms: -1.1 + 1.1 = 0.0 0.0 + x = 1.417744688 + 1.1 x = 1.417744688 + 1.1 Combine like terms: 1.417744688 + 1.1 = 2.517744688 x = 2.517744688 Simplifying x = 2.517744688

Subproblem 2

x + -1.1 = -1.417744688 Simplifying x + -1.1 = -1.417744688 Reorder the terms: -1.1 + x = -1.417744688 Solving -1.1 + x = -1.417744688 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.1' to each side of the equation. -1.1 + 1.1 + x = -1.417744688 + 1.1 Combine like terms: -1.1 + 1.1 = 0.0 0.0 + x = -1.417744688 + 1.1 x = -1.417744688 + 1.1 Combine like terms: -1.417744688 + 1.1 = -0.317744688 x = -0.317744688 Simplifying x = -0.317744688

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.517744688, -0.317744688}

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