15x^2-154x-25=0

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Solution for 15x^2-154x-25=0 equation:


Simplifying
15x2 + -154x + -25 = 0

Reorder the terms:
-25 + -154x + 15x2 = 0

Solving
-25 + -154x + 15x2 = 0

Solving for variable 'x'.

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

Divide each side by '15'.
-1.666666667 + -10.26666667x + x2 = 0

Move the constant term to the right:

Add '1.666666667' to each side of the equation.
-1.666666667 + -10.26666667x + 1.666666667 + x2 = 0 + 1.666666667

Reorder the terms:
-1.666666667 + 1.666666667 + -10.26666667x + x2 = 0 + 1.666666667

Combine like terms: -1.666666667 + 1.666666667 = 0.000000000
0.000000000 + -10.26666667x + x2 = 0 + 1.666666667
-10.26666667x + x2 = 0 + 1.666666667

Combine like terms: 0 + 1.666666667 = 1.666666667
-10.26666667x + x2 = 1.666666667

The x term is -10.26666667x.  Take half its coefficient (-5.133333335).
Square it (26.35111113) and add it to both sides.

Add '26.35111113' to each side of the equation.
-10.26666667x + 26.35111113 + x2 = 1.666666667 + 26.35111113

Reorder the terms:
26.35111113 + -10.26666667x + x2 = 1.666666667 + 26.35111113

Combine like terms: 1.666666667 + 26.35111113 = 28.017777797
26.35111113 + -10.26666667x + x2 = 28.017777797

Factor a perfect square on the left side:
(x + -5.133333335)(x + -5.133333335) = 28.017777797

Calculate the square root of the right side: 5.293182199

Break this problem into two subproblems by setting 
(x + -5.133333335) equal to 5.293182199 and -5.293182199.

Subproblem 1

x + -5.133333335 = 5.293182199 Simplifying x + -5.133333335 = 5.293182199 Reorder the terms: -5.133333335 + x = 5.293182199 Solving -5.133333335 + x = 5.293182199 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5.133333335' to each side of the equation. -5.133333335 + 5.133333335 + x = 5.293182199 + 5.133333335 Combine like terms: -5.133333335 + 5.133333335 = 0.000000000 0.000000000 + x = 5.293182199 + 5.133333335 x = 5.293182199 + 5.133333335 Combine like terms: 5.293182199 + 5.133333335 = 10.426515534 x = 10.426515534 Simplifying x = 10.426515534

Subproblem 2

x + -5.133333335 = -5.293182199 Simplifying x + -5.133333335 = -5.293182199 Reorder the terms: -5.133333335 + x = -5.293182199 Solving -5.133333335 + x = -5.293182199 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5.133333335' to each side of the equation. -5.133333335 + 5.133333335 + x = -5.293182199 + 5.133333335 Combine like terms: -5.133333335 + 5.133333335 = 0.000000000 0.000000000 + x = -5.293182199 + 5.133333335 x = -5.293182199 + 5.133333335 Combine like terms: -5.293182199 + 5.133333335 = -0.159848864 x = -0.159848864 Simplifying x = -0.159848864

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.426515534, -0.159848864}

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