2x^2+7x=18

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Solution for 2x^2+7x=18 equation:


Simplifying
2x2 + 7x = 18

Reorder the terms:
7x + 2x2 = 18

Solving
7x + 2x2 = 18

Solving for variable 'x'.

Reorder the terms:
-18 + 7x + 2x2 = 18 + -18

Combine like terms: 18 + -18 = 0
-18 + 7x + 2x2 = 0

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

Divide each side by '2'.
-9 + 3.5x + x2 = 0

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + 3.5x + 9 + x2 = 0 + 9

Reorder the terms:
-9 + 9 + 3.5x + x2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + 3.5x + x2 = 0 + 9
3.5x + x2 = 0 + 9

Combine like terms: 0 + 9 = 9
3.5x + x2 = 9

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 = 9 + 3.0625

Reorder the terms:
3.0625 + 3.5x + x2 = 9 + 3.0625

Combine like terms: 9 + 3.0625 = 12.0625
3.0625 + 3.5x + x2 = 12.0625

Factor a perfect square on the left side:
(x + 1.75)(x + 1.75) = 12.0625

Calculate the square root of the right side: 3.473110997

Break this problem into two subproblems by setting 
(x + 1.75) equal to 3.473110997 and -3.473110997.

Subproblem 1

x + 1.75 = 3.473110997 Simplifying x + 1.75 = 3.473110997 Reorder the terms: 1.75 + x = 3.473110997 Solving 1.75 + x = 3.473110997 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 = 3.473110997 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + x = 3.473110997 + -1.75 x = 3.473110997 + -1.75 Combine like terms: 3.473110997 + -1.75 = 1.723110997 x = 1.723110997 Simplifying x = 1.723110997

Subproblem 2

x + 1.75 = -3.473110997 Simplifying x + 1.75 = -3.473110997 Reorder the terms: 1.75 + x = -3.473110997 Solving 1.75 + x = -3.473110997 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 = -3.473110997 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + x = -3.473110997 + -1.75 x = -3.473110997 + -1.75 Combine like terms: -3.473110997 + -1.75 = -5.223110997 x = -5.223110997 Simplifying x = -5.223110997

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.723110997, -5.223110997}

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