15x=2x^2+16

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Solution for 15x=2x^2+16 equation:


Simplifying
15x = 2x2 + 16

Reorder the terms:
15x = 16 + 2x2

Solving
15x = 16 + 2x2

Solving for variable 'x'.

Reorder the terms:
-16 + 15x + -2x2 = 16 + 2x2 + -16 + -2x2

Reorder the terms:
-16 + 15x + -2x2 = 16 + -16 + 2x2 + -2x2

Combine like terms: 16 + -16 = 0
-16 + 15x + -2x2 = 0 + 2x2 + -2x2
-16 + 15x + -2x2 = 2x2 + -2x2

Combine like terms: 2x2 + -2x2 = 0
-16 + 15x + -2x2 = 0

Begin completing the square.  Divide all terms by
-2 the coefficient of the squared term: 

Divide each side by '-2'.
8 + -7.5x + x2 = 0

Move the constant term to the right:

Add '-8' to each side of the equation.
8 + -7.5x + -8 + x2 = 0 + -8

Reorder the terms:
8 + -8 + -7.5x + x2 = 0 + -8

Combine like terms: 8 + -8 = 0
0 + -7.5x + x2 = 0 + -8
-7.5x + x2 = 0 + -8

Combine like terms: 0 + -8 = -8
-7.5x + x2 = -8

The x term is -7.5x.  Take half its coefficient (-3.75).
Square it (14.0625) and add it to both sides.

Add '14.0625' to each side of the equation.
-7.5x + 14.0625 + x2 = -8 + 14.0625

Reorder the terms:
14.0625 + -7.5x + x2 = -8 + 14.0625

Combine like terms: -8 + 14.0625 = 6.0625
14.0625 + -7.5x + x2 = 6.0625

Factor a perfect square on the left side:
(x + -3.75)(x + -3.75) = 6.0625

Calculate the square root of the right side: 2.46221445

Break this problem into two subproblems by setting 
(x + -3.75) equal to 2.46221445 and -2.46221445.

Subproblem 1

x + -3.75 = 2.46221445 Simplifying x + -3.75 = 2.46221445 Reorder the terms: -3.75 + x = 2.46221445 Solving -3.75 + x = 2.46221445 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.75' to each side of the equation. -3.75 + 3.75 + x = 2.46221445 + 3.75 Combine like terms: -3.75 + 3.75 = 0.00 0.00 + x = 2.46221445 + 3.75 x = 2.46221445 + 3.75 Combine like terms: 2.46221445 + 3.75 = 6.21221445 x = 6.21221445 Simplifying x = 6.21221445

Subproblem 2

x + -3.75 = -2.46221445 Simplifying x + -3.75 = -2.46221445 Reorder the terms: -3.75 + x = -2.46221445 Solving -3.75 + x = -2.46221445 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.75' to each side of the equation. -3.75 + 3.75 + x = -2.46221445 + 3.75 Combine like terms: -3.75 + 3.75 = 0.00 0.00 + x = -2.46221445 + 3.75 x = -2.46221445 + 3.75 Combine like terms: -2.46221445 + 3.75 = 1.28778555 x = 1.28778555 Simplifying x = 1.28778555

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.21221445, 1.28778555}

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