x*(x-4)=165

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Solution for x*(x-4)=165 equation:


Simplifying
x(x + -4) = 165

Reorder the terms:
x(-4 + x) = 165
(-4 * x + x * x) = 165
(-4x + x2) = 165

Solving
-4x + x2 = 165

Solving for variable 'x'.

Reorder the terms:
-165 + -4x + x2 = 165 + -165

Combine like terms: 165 + -165 = 0
-165 + -4x + x2 = 0

Factor a trinomial.
(-11 + -1x)(15 + -1x) = 0

Subproblem 1

Set the factor '(-11 + -1x)' equal to zero and attempt to solve: Simplifying -11 + -1x = 0 Solving -11 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '11' to each side of the equation. -11 + 11 + -1x = 0 + 11 Combine like terms: -11 + 11 = 0 0 + -1x = 0 + 11 -1x = 0 + 11 Combine like terms: 0 + 11 = 11 -1x = 11 Divide each side by '-1'. x = -11 Simplifying x = -11

Subproblem 2

Set the factor '(15 + -1x)' equal to zero and attempt to solve: Simplifying 15 + -1x = 0 Solving 15 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + -1x = 0 + -15 Combine like terms: 15 + -15 = 0 0 + -1x = 0 + -15 -1x = 0 + -15 Combine like terms: 0 + -15 = -15 -1x = -15 Divide each side by '-1'. x = 15 Simplifying x = 15

Solution

x = {-11, 15}

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