3x(10-x)=81

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Solution for 3x(10-x)=81 equation:


Simplifying
3x(10 + -1x) = 81
(10 * 3x + -1x * 3x) = 81
(30x + -3x2) = 81

Solving
30x + -3x2 = 81

Solving for variable 'x'.

Reorder the terms:
-81 + 30x + -3x2 = 81 + -81

Combine like terms: 81 + -81 = 0
-81 + 30x + -3x2 = 0

Factor out the Greatest Common Factor (GCF), '3'.
3(-27 + 10x + -1x2) = 0

Ignore the factor 3.

Subproblem 1

Set the factor '(-27 + 10x + -1x2)' equal to zero and attempt to solve: Simplifying -27 + 10x + -1x2 = 0 Solving -27 + 10x + -1x2 = 0 Begin completing the square. Divide all terms by -1 the coefficient of the squared term: Divide each side by '-1'. 27 + -10x + x2 = 0 Move the constant term to the right: Add '-27' to each side of the equation. 27 + -10x + -27 + x2 = 0 + -27 Reorder the terms: 27 + -27 + -10x + x2 = 0 + -27 Combine like terms: 27 + -27 = 0 0 + -10x + x2 = 0 + -27 -10x + x2 = 0 + -27 Combine like terms: 0 + -27 = -27 -10x + x2 = -27 The x term is -10x. Take half its coefficient (-5). Square it (25) and add it to both sides. Add '25' to each side of the equation. -10x + 25 + x2 = -27 + 25 Reorder the terms: 25 + -10x + x2 = -27 + 25 Combine like terms: -27 + 25 = -2 25 + -10x + x2 = -2 Factor a perfect square on the left side: (x + -5)(x + -5) = -2 Can't calculate square root of the right side. The solution to this equation could not be determined. This subproblem is being ignored because a solution could not be determined. The solution to this equation could not be determined.

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