x^2+20=-21x

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Solution for x^2+20=-21x equation:


Simplifying
x2 + 20 = -21x

Reorder the terms:
20 + x2 = -21x

Solving
20 + x2 = -21x

Solving for variable 'x'.

Reorder the terms:
20 + 21x + x2 = -21x + 21x

Combine like terms: -21x + 21x = 0
20 + 21x + x2 = 0

Factor a trinomial.
(20 + x)(1 + x) = 0

Subproblem 1

Set the factor '(20 + x)' equal to zero and attempt to solve: Simplifying 20 + x = 0 Solving 20 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + x = 0 + -20 Combine like terms: 20 + -20 = 0 0 + x = 0 + -20 x = 0 + -20 Combine like terms: 0 + -20 = -20 x = -20 Simplifying x = -20

Subproblem 2

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

Solution

x = {-20, -1}

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