X^2-15X+30=3X

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Solution for X^2-15X+30=3X equation:


Simplifying
X2 + -15X + 30 = 3X

Reorder the terms:
30 + -15X + X2 = 3X

Solving
30 + -15X + X2 = 3X

Solving for variable 'X'.

Reorder the terms:
30 + -15X + -3X + X2 = 3X + -3X

Combine like terms: -15X + -3X = -18X
30 + -18X + X2 = 3X + -3X

Combine like terms: 3X + -3X = 0
30 + -18X + X2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-30' to each side of the equation.
30 + -18X + -30 + X2 = 0 + -30

Reorder the terms:
30 + -30 + -18X + X2 = 0 + -30

Combine like terms: 30 + -30 = 0
0 + -18X + X2 = 0 + -30
-18X + X2 = 0 + -30

Combine like terms: 0 + -30 = -30
-18X + X2 = -30

The X term is -18X.  Take half its coefficient (-9).
Square it (81) and add it to both sides.

Add '81' to each side of the equation.
-18X + 81 + X2 = -30 + 81

Reorder the terms:
81 + -18X + X2 = -30 + 81

Combine like terms: -30 + 81 = 51
81 + -18X + X2 = 51

Factor a perfect square on the left side:
(X + -9)(X + -9) = 51

Calculate the square root of the right side: 7.141428429

Break this problem into two subproblems by setting 
(X + -9) equal to 7.141428429 and -7.141428429.

Subproblem 1

X + -9 = 7.141428429 Simplifying X + -9 = 7.141428429 Reorder the terms: -9 + X = 7.141428429 Solving -9 + X = 7.141428429 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + X = 7.141428429 + 9 Combine like terms: -9 + 9 = 0 0 + X = 7.141428429 + 9 X = 7.141428429 + 9 Combine like terms: 7.141428429 + 9 = 16.141428429 X = 16.141428429 Simplifying X = 16.141428429

Subproblem 2

X + -9 = -7.141428429 Simplifying X + -9 = -7.141428429 Reorder the terms: -9 + X = -7.141428429 Solving -9 + X = -7.141428429 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + X = -7.141428429 + 9 Combine like terms: -9 + 9 = 0 0 + X = -7.141428429 + 9 X = -7.141428429 + 9 Combine like terms: -7.141428429 + 9 = 1.858571571 X = 1.858571571 Simplifying X = 1.858571571

Solution

The solution to the problem is based on the solutions from the subproblems. X = {16.141428429, 1.858571571}

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