9=x(4-x)

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Solution for 9=x(4-x) equation:


Simplifying
9 = x(4 + -1x)
9 = (4 * x + -1x * x)
9 = (4x + -1x2)

Solving
9 = 4x + -1x2

Solving for variable 'x'.

Reorder the terms:
9 + -4x + x2 = 4x + -4x + -1x2 + x2

Combine like terms: 4x + -4x = 0
9 + -4x + x2 = 0 + -1x2 + x2
9 + -4x + x2 = -1x2 + x2

Combine like terms: -1x2 + x2 = 0
9 + -4x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-9' to each side of the equation.
9 + -4x + -9 + x2 = 0 + -9

Reorder the terms:
9 + -9 + -4x + x2 = 0 + -9

Combine like terms: 9 + -9 = 0
0 + -4x + x2 = 0 + -9
-4x + x2 = 0 + -9

Combine like terms: 0 + -9 = -9
-4x + x2 = -9

The x term is -4x.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4x + 4 + x2 = -9 + 4

Reorder the terms:
4 + -4x + x2 = -9 + 4

Combine like terms: -9 + 4 = -5
4 + -4x + x2 = -5

Factor a perfect square on the left side:
(x + -2)(x + -2) = -5

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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