(10x-9y)(10x+9y)=n

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Solution for (10x-9y)(10x+9y)=n equation:


Simplifying
(10x + -9y)(10x + 9y) = n

Multiply (10x + -9y) * (10x + 9y)
(10x * (10x + 9y) + -9y * (10x + 9y)) = n
((10x * 10x + 9y * 10x) + -9y * (10x + 9y)) = n

Reorder the terms:
((90xy + 100x2) + -9y * (10x + 9y)) = n
((90xy + 100x2) + -9y * (10x + 9y)) = n
(90xy + 100x2 + (10x * -9y + 9y * -9y)) = n
(90xy + 100x2 + (-90xy + -81y2)) = n

Reorder the terms:
(90xy + -90xy + 100x2 + -81y2) = n

Combine like terms: 90xy + -90xy = 0
(0 + 100x2 + -81y2) = n
(100x2 + -81y2) = n

Solving
100x2 + -81y2 = n

Solving for variable 'x'.

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

Add '81y2' to each side of the equation.
100x2 + -81y2 + 81y2 = n + 81y2

Combine like terms: -81y2 + 81y2 = 0
100x2 + 0 = n + 81y2
100x2 = n + 81y2

Divide each side by '100'.
x2 = 0.01n + 0.81y2

Simplifying
x2 = 0.01n + 0.81y2

Reorder the terms:
-0.01n + x2 + -0.81y2 = 0.01n + 0.81y2 + -0.01n + -0.81y2

Reorder the terms:
-0.01n + x2 + -0.81y2 = 0.01n + -0.01n + 0.81y2 + -0.81y2

Combine like terms: 0.01n + -0.01n = 0.00
-0.01n + x2 + -0.81y2 = 0.00 + 0.81y2 + -0.81y2
-0.01n + x2 + -0.81y2 = 0.81y2 + -0.81y2

Combine like terms: 0.81y2 + -0.81y2 = 0.00
-0.01n + x2 + -0.81y2 = 0.00

The solution to this equation could not be determined.

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