x*(20-x)=91

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Solution for x*(20-x)=91 equation:


Simplifying
x(20 + -1x) = 91
(20 * x + -1x * x) = 91
(20x + -1x2) = 91

Solving
20x + -1x2 = 91

Solving for variable 'x'.

Reorder the terms:
-91 + 20x + -1x2 = 91 + -91

Combine like terms: 91 + -91 = 0
-91 + 20x + -1x2 = 0

Factor a trinomial.
(-13 + x)(7 + -1x) = 0

Subproblem 1

Set the factor '(-13 + x)' equal to zero and attempt to solve: Simplifying -13 + x = 0 Solving -13 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '13' to each side of the equation. -13 + 13 + x = 0 + 13 Combine like terms: -13 + 13 = 0 0 + x = 0 + 13 x = 0 + 13 Combine like terms: 0 + 13 = 13 x = 13 Simplifying x = 13

Subproblem 2

Set the factor '(7 + -1x)' equal to zero and attempt to solve: Simplifying 7 + -1x = 0 Solving 7 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -1x = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -1x = 0 + -7 -1x = 0 + -7 Combine like terms: 0 + -7 = -7 -1x = -7 Divide each side by '-1'. x = 7 Simplifying x = 7

Solution

x = {13, 7}

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