(x-9)(x+9)-y^2=

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Solution for (x-9)(x+9)-y^2= equation:


Simplifying
(x + -9)(x + 9) + -1y2 = 0

Reorder the terms:
(-9 + x)(x + 9) + -1y2 = 0

Reorder the terms:
(-9 + x)(9 + x) + -1y2 = 0

Multiply (-9 + x) * (9 + x)
(-9(9 + x) + x(9 + x)) + -1y2 = 0
((9 * -9 + x * -9) + x(9 + x)) + -1y2 = 0
((-81 + -9x) + x(9 + x)) + -1y2 = 0
(-81 + -9x + (9 * x + x * x)) + -1y2 = 0
(-81 + -9x + (9x + x2)) + -1y2 = 0

Combine like terms: -9x + 9x = 0
(-81 + 0 + x2) + -1y2 = 0
(-81 + x2) + -1y2 = 0

Solving
-81 + x2 + -1y2 = 0

Solving for variable 'x'.

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

Add '81' to each side of the equation.
-81 + x2 + 81 + -1y2 = 0 + 81

Reorder the terms:
-81 + 81 + x2 + -1y2 = 0 + 81

Combine like terms: -81 + 81 = 0
0 + x2 + -1y2 = 0 + 81
x2 + -1y2 = 0 + 81

Combine like terms: 0 + 81 = 81
x2 + -1y2 = 81

Add 'y2' to each side of the equation.
x2 + -1y2 + y2 = 81 + y2

Combine like terms: -1y2 + y2 = 0
x2 + 0 = 81 + y2
x2 = 81 + y2

Simplifying
x2 = 81 + y2

Reorder the terms:
-81 + x2 + -1y2 = 81 + y2 + -81 + -1y2

Reorder the terms:
-81 + x2 + -1y2 = 81 + -81 + y2 + -1y2

Combine like terms: 81 + -81 = 0
-81 + x2 + -1y2 = 0 + y2 + -1y2
-81 + x2 + -1y2 = y2 + -1y2

Combine like terms: y2 + -1y2 = 0
-81 + x2 + -1y2 = 0

The solution to this equation could not be determined.

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