-x^2=21x-100

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Solution for -x^2=21x-100 equation:


Simplifying
-1x2 = 21x + -100

Reorder the terms:
-1x2 = -100 + 21x

Solving
-1x2 = -100 + 21x

Solving for variable 'x'.

Reorder the terms:
100 + -21x + -1x2 = -100 + 21x + 100 + -21x

Reorder the terms:
100 + -21x + -1x2 = -100 + 100 + 21x + -21x

Combine like terms: -100 + 100 = 0
100 + -21x + -1x2 = 0 + 21x + -21x
100 + -21x + -1x2 = 21x + -21x

Combine like terms: 21x + -21x = 0
100 + -21x + -1x2 = 0

Factor a trinomial.
(4 + -1x)(25 + x) = 0

Subproblem 1

Set the factor '(4 + -1x)' equal to zero and attempt to solve: Simplifying 4 + -1x = 0 Solving 4 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + -1x = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -1x = 0 + -4 -1x = 0 + -4 Combine like terms: 0 + -4 = -4 -1x = -4 Divide each side by '-1'. x = 4 Simplifying x = 4

Subproblem 2

Set the factor '(25 + x)' equal to zero and attempt to solve: Simplifying 25 + x = 0 Solving 25 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '-25' to each side of the equation. 25 + -25 + x = 0 + -25 Combine like terms: 25 + -25 = 0 0 + x = 0 + -25 x = 0 + -25 Combine like terms: 0 + -25 = -25 x = -25 Simplifying x = -25

Solution

x = {4, -25}

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