490=X(10-X)

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Solution for 490=X(10-X) equation:


Simplifying
490 = X(10 + -1X)
490 = (10 * X + -1X * X)
490 = (10X + -1X2)

Solving
490 = 10X + -1X2

Solving for variable 'X'.

Reorder the terms:
490 + -10X + X2 = 10X + -10X + -1X2 + X2

Combine like terms: 10X + -10X = 0
490 + -10X + X2 = 0 + -1X2 + X2
490 + -10X + X2 = -1X2 + X2

Combine like terms: -1X2 + X2 = 0
490 + -10X + X2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-490' to each side of the equation.
490 + -10X + -490 + X2 = 0 + -490

Reorder the terms:
490 + -490 + -10X + X2 = 0 + -490

Combine like terms: 490 + -490 = 0
0 + -10X + X2 = 0 + -490
-10X + X2 = 0 + -490

Combine like terms: 0 + -490 = -490
-10X + X2 = -490

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 = -490 + 25

Reorder the terms:
25 + -10X + X2 = -490 + 25

Combine like terms: -490 + 25 = -465
25 + -10X + X2 = -465

Factor a perfect square on the left side:
(X + -5)(X + -5) = -465

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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