5x^2-14x-76=0

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Solution for 5x^2-14x-76=0 equation:


Simplifying
5x2 + -14x + -76 = 0

Reorder the terms:
-76 + -14x + 5x2 = 0

Solving
-76 + -14x + 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'.
-15.2 + -2.8x + x2 = 0

Move the constant term to the right:

Add '15.2' to each side of the equation.
-15.2 + -2.8x + 15.2 + x2 = 0 + 15.2

Reorder the terms:
-15.2 + 15.2 + -2.8x + x2 = 0 + 15.2

Combine like terms: -15.2 + 15.2 = 0.0
0.0 + -2.8x + x2 = 0 + 15.2
-2.8x + x2 = 0 + 15.2

Combine like terms: 0 + 15.2 = 15.2
-2.8x + x2 = 15.2

The x term is -2.8x.  Take half its coefficient (-1.4).
Square it (1.96) and add it to both sides.

Add '1.96' to each side of the equation.
-2.8x + 1.96 + x2 = 15.2 + 1.96

Reorder the terms:
1.96 + -2.8x + x2 = 15.2 + 1.96

Combine like terms: 15.2 + 1.96 = 17.16
1.96 + -2.8x + x2 = 17.16

Factor a perfect square on the left side:
(x + -1.4)(x + -1.4) = 17.16

Calculate the square root of the right side: 4.142463035

Break this problem into two subproblems by setting 
(x + -1.4) equal to 4.142463035 and -4.142463035.

Subproblem 1

x + -1.4 = 4.142463035 Simplifying x + -1.4 = 4.142463035 Reorder the terms: -1.4 + x = 4.142463035 Solving -1.4 + x = 4.142463035 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.4' to each side of the equation. -1.4 + 1.4 + x = 4.142463035 + 1.4 Combine like terms: -1.4 + 1.4 = 0.0 0.0 + x = 4.142463035 + 1.4 x = 4.142463035 + 1.4 Combine like terms: 4.142463035 + 1.4 = 5.542463035 x = 5.542463035 Simplifying x = 5.542463035

Subproblem 2

x + -1.4 = -4.142463035 Simplifying x + -1.4 = -4.142463035 Reorder the terms: -1.4 + x = -4.142463035 Solving -1.4 + x = -4.142463035 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.4' to each side of the equation. -1.4 + 1.4 + x = -4.142463035 + 1.4 Combine like terms: -1.4 + 1.4 = 0.0 0.0 + x = -4.142463035 + 1.4 x = -4.142463035 + 1.4 Combine like terms: -4.142463035 + 1.4 = -2.742463035 x = -2.742463035 Simplifying x = -2.742463035

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.542463035, -2.742463035}

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