400+q^2=20q+100

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Solution for 400+q^2=20q+100 equation:


Simplifying
400 + q2 = 20q + 100

Reorder the terms:
400 + q2 = 100 + 20q

Solving
400 + q2 = 100 + 20q

Solving for variable 'q'.

Reorder the terms:
400 + -100 + -20q + q2 = 100 + 20q + -100 + -20q

Combine like terms: 400 + -100 = 300
300 + -20q + q2 = 100 + 20q + -100 + -20q

Reorder the terms:
300 + -20q + q2 = 100 + -100 + 20q + -20q

Combine like terms: 100 + -100 = 0
300 + -20q + q2 = 0 + 20q + -20q
300 + -20q + q2 = 20q + -20q

Combine like terms: 20q + -20q = 0
300 + -20q + q2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-300' to each side of the equation.
300 + -20q + -300 + q2 = 0 + -300

Reorder the terms:
300 + -300 + -20q + q2 = 0 + -300

Combine like terms: 300 + -300 = 0
0 + -20q + q2 = 0 + -300
-20q + q2 = 0 + -300

Combine like terms: 0 + -300 = -300
-20q + q2 = -300

The q term is -20q.  Take half its coefficient (-10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
-20q + 100 + q2 = -300 + 100

Reorder the terms:
100 + -20q + q2 = -300 + 100

Combine like terms: -300 + 100 = -200
100 + -20q + q2 = -200

Factor a perfect square on the left side:
(q + -10)(q + -10) = -200

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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