x(8-x)=84

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Solution for x(8-x)=84 equation:


Simplifying
x(8 + -1x) = 84
(8 * x + -1x * x) = 84
(8x + -1x2) = 84

Solving
8x + -1x2 = 84

Solving for variable 'x'.

Reorder the terms:
-84 + 8x + -1x2 = 84 + -84

Combine like terms: 84 + -84 = 0
-84 + 8x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
84 + -8x + x2 = 0

Move the constant term to the right:

Add '-84' to each side of the equation.
84 + -8x + -84 + x2 = 0 + -84

Reorder the terms:
84 + -84 + -8x + x2 = 0 + -84

Combine like terms: 84 + -84 = 0
0 + -8x + x2 = 0 + -84
-8x + x2 = 0 + -84

Combine like terms: 0 + -84 = -84
-8x + x2 = -84

The x term is -8x.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8x + 16 + x2 = -84 + 16

Reorder the terms:
16 + -8x + x2 = -84 + 16

Combine like terms: -84 + 16 = -68
16 + -8x + x2 = -68

Factor a perfect square on the left side:
(x + -4)(x + -4) = -68

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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