221=x*(x+4)

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Solution for 221=x*(x+4) equation:


Simplifying
221 = x(x + 4)

Reorder the terms:
221 = x(4 + x)
221 = (4 * x + x * x)
221 = (4x + x2)

Solving
221 = 4x + x2

Solving for variable 'x'.

Reorder the terms:
221 + -4x + -1x2 = 4x + -4x + x2 + -1x2

Combine like terms: 4x + -4x = 0
221 + -4x + -1x2 = 0 + x2 + -1x2
221 + -4x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
221 + -4x + -1x2 = 0

Factor a trinomial.
(13 + -1x)(17 + x) = 0

Subproblem 1

Set the factor '(13 + -1x)' equal to zero and attempt to solve: Simplifying 13 + -1x = 0 Solving 13 + -1x = 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 + -1x = 0 + -13 Combine like terms: 13 + -13 = 0 0 + -1x = 0 + -13 -1x = 0 + -13 Combine like terms: 0 + -13 = -13 -1x = -13 Divide each side by '-1'. x = 13 Simplifying x = 13

Subproblem 2

Set the factor '(17 + x)' equal to zero and attempt to solve: Simplifying 17 + x = 0 Solving 17 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '-17' to each side of the equation. 17 + -17 + x = 0 + -17 Combine like terms: 17 + -17 = 0 0 + x = 0 + -17 x = 0 + -17 Combine like terms: 0 + -17 = -17 x = -17 Simplifying x = -17

Solution

x = {13, -17}

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