0=-x^2+x+20

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Solution for 0=-x^2+x+20 equation:


Simplifying
0 = -1x2 + x + 20

Reorder the terms:
0 = 20 + x + -1x2

Solving
0 = 20 + x + -1x2

Solving for variable 'x'.

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

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

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

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

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

Factor a trinomial.
(-4 + -1x)(5 + -1x) = 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 '(5 + -1x)' equal to zero and attempt to solve: Simplifying 5 + -1x = 0 Solving 5 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + -1x = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -1x = 0 + -5 -1x = 0 + -5 Combine like terms: 0 + -5 = -5 -1x = -5 Divide each side by '-1'. x = 5 Simplifying x = 5

Solution

x = {-4, 5}

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