r^2+3r-14=0

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Solution for r^2+3r-14=0 equation:


Simplifying
r2 + 3r + -14 = 0

Reorder the terms:
-14 + 3r + r2 = 0

Solving
-14 + 3r + r2 = 0

Solving for variable 'r'.

Begin completing the square.

Move the constant term to the right:

Add '14' to each side of the equation.
-14 + 3r + 14 + r2 = 0 + 14

Reorder the terms:
-14 + 14 + 3r + r2 = 0 + 14

Combine like terms: -14 + 14 = 0
0 + 3r + r2 = 0 + 14
3r + r2 = 0 + 14

Combine like terms: 0 + 14 = 14
3r + r2 = 14

The r term is 3r.  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.
3r + 2.25 + r2 = 14 + 2.25

Reorder the terms:
2.25 + 3r + r2 = 14 + 2.25

Combine like terms: 14 + 2.25 = 16.25
2.25 + 3r + r2 = 16.25

Factor a perfect square on the left side:
(r + 1.5)(r + 1.5) = 16.25

Calculate the square root of the right side: 4.031128874

Break this problem into two subproblems by setting 
(r + 1.5) equal to 4.031128874 and -4.031128874.

Subproblem 1

r + 1.5 = 4.031128874 Simplifying r + 1.5 = 4.031128874 Reorder the terms: 1.5 + r = 4.031128874 Solving 1.5 + r = 4.031128874 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + r = 4.031128874 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + r = 4.031128874 + -1.5 r = 4.031128874 + -1.5 Combine like terms: 4.031128874 + -1.5 = 2.531128874 r = 2.531128874 Simplifying r = 2.531128874

Subproblem 2

r + 1.5 = -4.031128874 Simplifying r + 1.5 = -4.031128874 Reorder the terms: 1.5 + r = -4.031128874 Solving 1.5 + r = -4.031128874 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + r = -4.031128874 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + r = -4.031128874 + -1.5 r = -4.031128874 + -1.5 Combine like terms: -4.031128874 + -1.5 = -5.531128874 r = -5.531128874 Simplifying r = -5.531128874

Solution

The solution to the problem is based on the solutions from the subproblems. r = {2.531128874, -5.531128874}

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