-20x-x^2=100-400

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Solution for -20x-x^2=100-400 equation:


Simplifying
-20x + -1x2 = 100 + -400

Combine like terms: 100 + -400 = -300
-20x + -1x2 = -300

Solving
-20x + -1x2 = -300

Solving for variable 'x'.

Reorder the terms:
300 + -20x + -1x2 = -300 + 300

Combine like terms: -300 + 300 = 0
300 + -20x + -1x2 = 0

Factor a trinomial.
(10 + -1x)(30 + x) = 0

Subproblem 1

Set the factor '(10 + -1x)' equal to zero and attempt to solve: Simplifying 10 + -1x = 0 Solving 10 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + -1x = 0 + -10 Combine like terms: 10 + -10 = 0 0 + -1x = 0 + -10 -1x = 0 + -10 Combine like terms: 0 + -10 = -10 -1x = -10 Divide each side by '-1'. x = 10 Simplifying x = 10

Subproblem 2

Set the factor '(30 + x)' equal to zero and attempt to solve: Simplifying 30 + x = 0 Solving 30 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '-30' to each side of the equation. 30 + -30 + x = 0 + -30 Combine like terms: 30 + -30 = 0 0 + x = 0 + -30 x = 0 + -30 Combine like terms: 0 + -30 = -30 x = -30 Simplifying x = -30

Solution

x = {10, -30}

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