5X^2-7X-15=0

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Solution for 5X^2-7X-15=0 equation:


Simplifying
5X2 + -7X + -15 = 0

Reorder the terms:
-15 + -7X + 5X2 = 0

Solving
-15 + -7X + 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'.
-3 + -1.4X + X2 = 0

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + -1.4X + 3 + X2 = 0 + 3

Reorder the terms:
-3 + 3 + -1.4X + X2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + -1.4X + X2 = 0 + 3
-1.4X + X2 = 0 + 3

Combine like terms: 0 + 3 = 3
-1.4X + X2 = 3

The X term is -1.4X.  Take half its coefficient (-0.7).
Square it (0.49) and add it to both sides.

Add '0.49' to each side of the equation.
-1.4X + 0.49 + X2 = 3 + 0.49

Reorder the terms:
0.49 + -1.4X + X2 = 3 + 0.49

Combine like terms: 3 + 0.49 = 3.49
0.49 + -1.4X + X2 = 3.49

Factor a perfect square on the left side:
(X + -0.7)(X + -0.7) = 3.49

Calculate the square root of the right side: 1.868154169

Break this problem into two subproblems by setting 
(X + -0.7) equal to 1.868154169 and -1.868154169.

Subproblem 1

X + -0.7 = 1.868154169 Simplifying X + -0.7 = 1.868154169 Reorder the terms: -0.7 + X = 1.868154169 Solving -0.7 + X = 1.868154169 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '0.7' to each side of the equation. -0.7 + 0.7 + X = 1.868154169 + 0.7 Combine like terms: -0.7 + 0.7 = 0.0 0.0 + X = 1.868154169 + 0.7 X = 1.868154169 + 0.7 Combine like terms: 1.868154169 + 0.7 = 2.568154169 X = 2.568154169 Simplifying X = 2.568154169

Subproblem 2

X + -0.7 = -1.868154169 Simplifying X + -0.7 = -1.868154169 Reorder the terms: -0.7 + X = -1.868154169 Solving -0.7 + X = -1.868154169 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '0.7' to each side of the equation. -0.7 + 0.7 + X = -1.868154169 + 0.7 Combine like terms: -0.7 + 0.7 = 0.0 0.0 + X = -1.868154169 + 0.7 X = -1.868154169 + 0.7 Combine like terms: -1.868154169 + 0.7 = -1.168154169 X = -1.168154169 Simplifying X = -1.168154169

Solution

The solution to the problem is based on the solutions from the subproblems. X = {2.568154169, -1.168154169}

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