5x^2-4x-74=0

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Solution for 5x^2-4x-74=0 equation:


Simplifying
5x2 + -4x + -74 = 0

Reorder the terms:
-74 + -4x + 5x2 = 0

Solving
-74 + -4x + 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'.
-14.8 + -0.8x + x2 = 0

Move the constant term to the right:

Add '14.8' to each side of the equation.
-14.8 + -0.8x + 14.8 + x2 = 0 + 14.8

Reorder the terms:
-14.8 + 14.8 + -0.8x + x2 = 0 + 14.8

Combine like terms: -14.8 + 14.8 = 0.0
0.0 + -0.8x + x2 = 0 + 14.8
-0.8x + x2 = 0 + 14.8

Combine like terms: 0 + 14.8 = 14.8
-0.8x + x2 = 14.8

The x term is -0.8x.  Take half its coefficient (-0.4).
Square it (0.16) and add it to both sides.

Add '0.16' to each side of the equation.
-0.8x + 0.16 + x2 = 14.8 + 0.16

Reorder the terms:
0.16 + -0.8x + x2 = 14.8 + 0.16

Combine like terms: 14.8 + 0.16 = 14.96
0.16 + -0.8x + x2 = 14.96

Factor a perfect square on the left side:
(x + -0.4)(x + -0.4) = 14.96

Calculate the square root of the right side: 3.867815921

Break this problem into two subproblems by setting 
(x + -0.4) equal to 3.867815921 and -3.867815921.

Subproblem 1

x + -0.4 = 3.867815921 Simplifying x + -0.4 = 3.867815921 Reorder the terms: -0.4 + x = 3.867815921 Solving -0.4 + x = 3.867815921 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.4' to each side of the equation. -0.4 + 0.4 + x = 3.867815921 + 0.4 Combine like terms: -0.4 + 0.4 = 0.0 0.0 + x = 3.867815921 + 0.4 x = 3.867815921 + 0.4 Combine like terms: 3.867815921 + 0.4 = 4.267815921 x = 4.267815921 Simplifying x = 4.267815921

Subproblem 2

x + -0.4 = -3.867815921 Simplifying x + -0.4 = -3.867815921 Reorder the terms: -0.4 + x = -3.867815921 Solving -0.4 + x = -3.867815921 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.4' to each side of the equation. -0.4 + 0.4 + x = -3.867815921 + 0.4 Combine like terms: -0.4 + 0.4 = 0.0 0.0 + x = -3.867815921 + 0.4 x = -3.867815921 + 0.4 Combine like terms: -3.867815921 + 0.4 = -3.467815921 x = -3.467815921 Simplifying x = -3.467815921

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.267815921, -3.467815921}

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