q^2+16q-25=0

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Solution for q^2+16q-25=0 equation:


Simplifying
q2 + 16q + -25 = 0

Reorder the terms:
-25 + 16q + q2 = 0

Solving
-25 + 16q + q2 = 0

Solving for variable 'q'.

Begin completing the square.

Move the constant term to the right:

Add '25' to each side of the equation.
-25 + 16q + 25 + q2 = 0 + 25

Reorder the terms:
-25 + 25 + 16q + q2 = 0 + 25

Combine like terms: -25 + 25 = 0
0 + 16q + q2 = 0 + 25
16q + q2 = 0 + 25

Combine like terms: 0 + 25 = 25
16q + q2 = 25

The q term is 16q.  Take half its coefficient (8).
Square it (64) and add it to both sides.

Add '64' to each side of the equation.
16q + 64 + q2 = 25 + 64

Reorder the terms:
64 + 16q + q2 = 25 + 64

Combine like terms: 25 + 64 = 89
64 + 16q + q2 = 89

Factor a perfect square on the left side:
(q + 8)(q + 8) = 89

Calculate the square root of the right side: 9.433981132

Break this problem into two subproblems by setting 
(q + 8) equal to 9.433981132 and -9.433981132.

Subproblem 1

q + 8 = 9.433981132 Simplifying q + 8 = 9.433981132 Reorder the terms: 8 + q = 9.433981132 Solving 8 + q = 9.433981132 Solving for variable 'q'. Move all terms containing q to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + q = 9.433981132 + -8 Combine like terms: 8 + -8 = 0 0 + q = 9.433981132 + -8 q = 9.433981132 + -8 Combine like terms: 9.433981132 + -8 = 1.433981132 q = 1.433981132 Simplifying q = 1.433981132

Subproblem 2

q + 8 = -9.433981132 Simplifying q + 8 = -9.433981132 Reorder the terms: 8 + q = -9.433981132 Solving 8 + q = -9.433981132 Solving for variable 'q'. Move all terms containing q to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + q = -9.433981132 + -8 Combine like terms: 8 + -8 = 0 0 + q = -9.433981132 + -8 q = -9.433981132 + -8 Combine like terms: -9.433981132 + -8 = -17.433981132 q = -17.433981132 Simplifying q = -17.433981132

Solution

The solution to the problem is based on the solutions from the subproblems. q = {1.433981132, -17.433981132}

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