15x^2-47x+30=0

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Solution for 15x^2-47x+30=0 equation:


Simplifying
15x2 + -47x + 30 = 0

Reorder the terms:
30 + -47x + 15x2 = 0

Solving
30 + -47x + 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'.
2 + -3.133333333x + x2 = 0

Move the constant term to the right:

Add '-2' to each side of the equation.
2 + -3.133333333x + -2 + x2 = 0 + -2

Reorder the terms:
2 + -2 + -3.133333333x + x2 = 0 + -2

Combine like terms: 2 + -2 = 0
0 + -3.133333333x + x2 = 0 + -2
-3.133333333x + x2 = 0 + -2

Combine like terms: 0 + -2 = -2
-3.133333333x + x2 = -2

The x term is -3.133333333x.  Take half its coefficient (-1.566666667).
Square it (2.454444445) and add it to both sides.

Add '2.454444445' to each side of the equation.
-3.133333333x + 2.454444445 + x2 = -2 + 2.454444445

Reorder the terms:
2.454444445 + -3.133333333x + x2 = -2 + 2.454444445

Combine like terms: -2 + 2.454444445 = 0.454444445
2.454444445 + -3.133333333x + x2 = 0.454444445

Factor a perfect square on the left side:
(x + -1.566666667)(x + -1.566666667) = 0.454444445

Calculate the square root of the right side: 0.674124948

Break this problem into two subproblems by setting 
(x + -1.566666667) equal to 0.674124948 and -0.674124948.

Subproblem 1

x + -1.566666667 = 0.674124948 Simplifying x + -1.566666667 = 0.674124948 Reorder the terms: -1.566666667 + x = 0.674124948 Solving -1.566666667 + x = 0.674124948 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.566666667' to each side of the equation. -1.566666667 + 1.566666667 + x = 0.674124948 + 1.566666667 Combine like terms: -1.566666667 + 1.566666667 = 0.000000000 0.000000000 + x = 0.674124948 + 1.566666667 x = 0.674124948 + 1.566666667 Combine like terms: 0.674124948 + 1.566666667 = 2.240791615 x = 2.240791615 Simplifying x = 2.240791615

Subproblem 2

x + -1.566666667 = -0.674124948 Simplifying x + -1.566666667 = -0.674124948 Reorder the terms: -1.566666667 + x = -0.674124948 Solving -1.566666667 + x = -0.674124948 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.566666667' to each side of the equation. -1.566666667 + 1.566666667 + x = -0.674124948 + 1.566666667 Combine like terms: -1.566666667 + 1.566666667 = 0.000000000 0.000000000 + x = -0.674124948 + 1.566666667 x = -0.674124948 + 1.566666667 Combine like terms: -0.674124948 + 1.566666667 = 0.892541719 x = 0.892541719 Simplifying x = 0.892541719

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.240791615, 0.892541719}

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