(x+y)(x-y)=15

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Solution for (x+y)(x-y)=15 equation:


Simplifying
(x + y)(x + -1y) = 15

Multiply (x + y) * (x + -1y)
(x(x + -1y) + y(x + -1y)) = 15
((x * x + -1y * x) + y(x + -1y)) = 15

Reorder the terms:
((-1xy + x2) + y(x + -1y)) = 15
((-1xy + x2) + y(x + -1y)) = 15
(-1xy + x2 + (x * y + -1y * y)) = 15
(-1xy + x2 + (xy + -1y2)) = 15

Reorder the terms:
(-1xy + xy + x2 + -1y2) = 15

Combine like terms: -1xy + xy = 0
(0 + x2 + -1y2) = 15
(x2 + -1y2) = 15

Solving
x2 + -1y2 = 15

Solving for variable 'x'.

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

Add 'y2' to each side of the equation.
x2 + -1y2 + y2 = 15 + y2

Combine like terms: -1y2 + y2 = 0
x2 + 0 = 15 + y2
x2 = 15 + y2

Simplifying
x2 = 15 + y2

Reorder the terms:
-15 + x2 + -1y2 = 15 + y2 + -15 + -1y2

Reorder the terms:
-15 + x2 + -1y2 = 15 + -15 + y2 + -1y2

Combine like terms: 15 + -15 = 0
-15 + x2 + -1y2 = 0 + y2 + -1y2
-15 + x2 + -1y2 = y2 + -1y2

Combine like terms: y2 + -1y2 = 0
-15 + x2 + -1y2 = 0

The solution to this equation could not be determined.

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