(X-9)(x+10)=90

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Solution for (X-9)(x+10)=90 equation:


Simplifying
(X + -9)(x + 10) = 90

Reorder the terms:
(-9 + X)(x + 10) = 90

Reorder the terms:
(-9 + X)(10 + x) = 90

Multiply (-9 + X) * (10 + x)
(-9(10 + x) + X(10 + x)) = 90
((10 * -9 + x * -9) + X(10 + x)) = 90
((-90 + -9x) + X(10 + x)) = 90
(-90 + -9x + (10 * X + x * X)) = 90
(-90 + -9x + (10X + xX)) = 90

Reorder the terms:
(-90 + 10X + -9x + xX) = 90
(-90 + 10X + -9x + xX) = 90

Solving
-90 + 10X + -9x + xX = 90

Solving for variable 'X'.

Move all terms containing X to the left, all other terms to the right.

Add '90' to each side of the equation.
-90 + 10X + -9x + 90 + xX = 90 + 90

Reorder the terms:
-90 + 90 + 10X + -9x + xX = 90 + 90

Combine like terms: -90 + 90 = 0
0 + 10X + -9x + xX = 90 + 90
10X + -9x + xX = 90 + 90

Combine like terms: 90 + 90 = 180
10X + -9x + xX = 180

Add '9x' to each side of the equation.
10X + -9x + 9x + xX = 180 + 9x

Combine like terms: -9x + 9x = 0
10X + 0 + xX = 180 + 9x
10X + xX = 180 + 9x

Reorder the terms:
-180 + 10X + -9x + xX = 180 + 9x + -180 + -9x

Reorder the terms:
-180 + 10X + -9x + xX = 180 + -180 + 9x + -9x

Combine like terms: 180 + -180 = 0
-180 + 10X + -9x + xX = 0 + 9x + -9x
-180 + 10X + -9x + xX = 9x + -9x

Combine like terms: 9x + -9x = 0
-180 + 10X + -9x + xX = 0

The solution to this equation could not be determined.

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