x^2+3x-16=340

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Solution for x^2+3x-16=340 equation:


Simplifying
x2 + 3x + -16 = 340

Reorder the terms:
-16 + 3x + x2 = 340

Solving
-16 + 3x + x2 = 340

Solving for variable 'x'.

Reorder the terms:
-16 + -340 + 3x + x2 = 340 + -340

Combine like terms: -16 + -340 = -356
-356 + 3x + x2 = 340 + -340

Combine like terms: 340 + -340 = 0
-356 + 3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '356' to each side of the equation.
-356 + 3x + 356 + x2 = 0 + 356

Reorder the terms:
-356 + 356 + 3x + x2 = 0 + 356

Combine like terms: -356 + 356 = 0
0 + 3x + x2 = 0 + 356
3x + x2 = 0 + 356

Combine like terms: 0 + 356 = 356
3x + x2 = 356

The x term is 3x.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3x + 2.25 + x2 = 356 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 356 + 2.25

Combine like terms: 356 + 2.25 = 358.25
2.25 + 3x + x2 = 358.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 358.25

Calculate the square root of the right side: 18.927493231

Break this problem into two subproblems by setting 
(x + 1.5) equal to 18.927493231 and -18.927493231.

Subproblem 1

x + 1.5 = 18.927493231 Simplifying x + 1.5 = 18.927493231 Reorder the terms: 1.5 + x = 18.927493231 Solving 1.5 + x = 18.927493231 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = 18.927493231 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 18.927493231 + -1.5 x = 18.927493231 + -1.5 Combine like terms: 18.927493231 + -1.5 = 17.427493231 x = 17.427493231 Simplifying x = 17.427493231

Subproblem 2

x + 1.5 = -18.927493231 Simplifying x + 1.5 = -18.927493231 Reorder the terms: 1.5 + x = -18.927493231 Solving 1.5 + x = -18.927493231 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = -18.927493231 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -18.927493231 + -1.5 x = -18.927493231 + -1.5 Combine like terms: -18.927493231 + -1.5 = -20.427493231 x = -20.427493231 Simplifying x = -20.427493231

Solution

The solution to the problem is based on the solutions from the subproblems. x = {17.427493231, -20.427493231}

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