5X^2-X-3=0

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Solution for 5X^2-X-3=0 equation:


Simplifying
5X2 + -1X + -3 = 0

Reorder the terms:
-3 + -1X + 5X2 = 0

Solving
-3 + -1X + 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'.
-0.6 + -0.2X + X2 = 0

Move the constant term to the right:

Add '0.6' to each side of the equation.
-0.6 + -0.2X + 0.6 + X2 = 0 + 0.6

Reorder the terms:
-0.6 + 0.6 + -0.2X + X2 = 0 + 0.6

Combine like terms: -0.6 + 0.6 = 0.0
0.0 + -0.2X + X2 = 0 + 0.6
-0.2X + X2 = 0 + 0.6

Combine like terms: 0 + 0.6 = 0.6
-0.2X + X2 = 0.6

The X term is -0.2X.  Take half its coefficient (-0.1).
Square it (0.01) and add it to both sides.

Add '0.01' to each side of the equation.
-0.2X + 0.01 + X2 = 0.6 + 0.01

Reorder the terms:
0.01 + -0.2X + X2 = 0.6 + 0.01

Combine like terms: 0.6 + 0.01 = 0.61
0.01 + -0.2X + X2 = 0.61

Factor a perfect square on the left side:
(X + -0.1)(X + -0.1) = 0.61

Calculate the square root of the right side: 0.781024968

Break this problem into two subproblems by setting 
(X + -0.1) equal to 0.781024968 and -0.781024968.

Subproblem 1

X + -0.1 = 0.781024968 Simplifying X + -0.1 = 0.781024968 Reorder the terms: -0.1 + X = 0.781024968 Solving -0.1 + X = 0.781024968 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '0.1' to each side of the equation. -0.1 + 0.1 + X = 0.781024968 + 0.1 Combine like terms: -0.1 + 0.1 = 0.0 0.0 + X = 0.781024968 + 0.1 X = 0.781024968 + 0.1 Combine like terms: 0.781024968 + 0.1 = 0.881024968 X = 0.881024968 Simplifying X = 0.881024968

Subproblem 2

X + -0.1 = -0.781024968 Simplifying X + -0.1 = -0.781024968 Reorder the terms: -0.1 + X = -0.781024968 Solving -0.1 + X = -0.781024968 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '0.1' to each side of the equation. -0.1 + 0.1 + X = -0.781024968 + 0.1 Combine like terms: -0.1 + 0.1 = 0.0 0.0 + X = -0.781024968 + 0.1 X = -0.781024968 + 0.1 Combine like terms: -0.781024968 + 0.1 = -0.681024968 X = -0.681024968 Simplifying X = -0.681024968

Solution

The solution to the problem is based on the solutions from the subproblems. X = {0.881024968, -0.681024968}

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