2x^2=x+2(3x+7)

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Solution for 2x^2=x+2(3x+7) equation:


Simplifying
2x2 = x + 2(3x + 7)

Reorder the terms:
2x2 = x + 2(7 + 3x)
2x2 = x + (7 * 2 + 3x * 2)
2x2 = x + (14 + 6x)

Reorder the terms:
2x2 = 14 + x + 6x

Combine like terms: x + 6x = 7x
2x2 = 14 + 7x

Solving
2x2 = 14 + 7x

Solving for variable 'x'.

Reorder the terms:
-14 + -7x + 2x2 = 14 + 7x + -14 + -7x

Reorder the terms:
-14 + -7x + 2x2 = 14 + -14 + 7x + -7x

Combine like terms: 14 + -14 = 0
-14 + -7x + 2x2 = 0 + 7x + -7x
-14 + -7x + 2x2 = 7x + -7x

Combine like terms: 7x + -7x = 0
-14 + -7x + 2x2 = 0

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

Divide each side by '2'.
-7 + -3.5x + x2 = 0

Move the constant term to the right:

Add '7' to each side of the equation.
-7 + -3.5x + 7 + x2 = 0 + 7

Reorder the terms:
-7 + 7 + -3.5x + x2 = 0 + 7

Combine like terms: -7 + 7 = 0
0 + -3.5x + x2 = 0 + 7
-3.5x + x2 = 0 + 7

Combine like terms: 0 + 7 = 7
-3.5x + x2 = 7

The x term is -3.5x.  Take half its coefficient (-1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
-3.5x + 3.0625 + x2 = 7 + 3.0625

Reorder the terms:
3.0625 + -3.5x + x2 = 7 + 3.0625

Combine like terms: 7 + 3.0625 = 10.0625
3.0625 + -3.5x + x2 = 10.0625

Factor a perfect square on the left side:
(x + -1.75)(x + -1.75) = 10.0625

Calculate the square root of the right side: 3.172144385

Break this problem into two subproblems by setting 
(x + -1.75) equal to 3.172144385 and -3.172144385.

Subproblem 1

x + -1.75 = 3.172144385 Simplifying x + -1.75 = 3.172144385 Reorder the terms: -1.75 + x = 3.172144385 Solving -1.75 + x = 3.172144385 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + x = 3.172144385 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x = 3.172144385 + 1.75 x = 3.172144385 + 1.75 Combine like terms: 3.172144385 + 1.75 = 4.922144385 x = 4.922144385 Simplifying x = 4.922144385

Subproblem 2

x + -1.75 = -3.172144385 Simplifying x + -1.75 = -3.172144385 Reorder the terms: -1.75 + x = -3.172144385 Solving -1.75 + x = -3.172144385 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + x = -3.172144385 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x = -3.172144385 + 1.75 x = -3.172144385 + 1.75 Combine like terms: -3.172144385 + 1.75 = -1.422144385 x = -1.422144385 Simplifying x = -1.422144385

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.922144385, -1.422144385}

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