21400+200=300x-x^2

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Solution for 21400+200=300x-x^2 equation:


Simplifying
21400 + 200 = 300x + -1x2

Combine like terms: 21400 + 200 = 21600
21600 = 300x + -1x2

Solving
21600 = 300x + -1x2

Solving for variable 'x'.

Reorder the terms:
21600 + -300x + x2 = 300x + -300x + -1x2 + x2

Combine like terms: 300x + -300x = 0
21600 + -300x + x2 = 0 + -1x2 + x2
21600 + -300x + x2 = -1x2 + x2

Combine like terms: -1x2 + x2 = 0
21600 + -300x + x2 = 0

Factor a trinomial.
(120 + -1x)(180 + -1x) = 0

Subproblem 1

Set the factor '(120 + -1x)' equal to zero and attempt to solve: Simplifying 120 + -1x = 0 Solving 120 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-120' to each side of the equation. 120 + -120 + -1x = 0 + -120 Combine like terms: 120 + -120 = 0 0 + -1x = 0 + -120 -1x = 0 + -120 Combine like terms: 0 + -120 = -120 -1x = -120 Divide each side by '-1'. x = 120 Simplifying x = 120

Subproblem 2

Set the factor '(180 + -1x)' equal to zero and attempt to solve: Simplifying 180 + -1x = 0 Solving 180 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-180' to each side of the equation. 180 + -180 + -1x = 0 + -180 Combine like terms: 180 + -180 = 0 0 + -1x = 0 + -180 -1x = 0 + -180 Combine like terms: 0 + -180 = -180 -1x = -180 Divide each side by '-1'. x = 180 Simplifying x = 180

Solution

x = {120, 180}

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