(x-4)(y+5)=0

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Solution for (x-4)(y+5)=0 equation:


Simplifying
(x + -4)(y + 5) = 0

Reorder the terms:
(-4 + x)(y + 5) = 0

Reorder the terms:
(-4 + x)(5 + y) = 0

Multiply (-4 + x) * (5 + y)
(-4(5 + y) + x(5 + y)) = 0
((5 * -4 + y * -4) + x(5 + y)) = 0
((-20 + -4y) + x(5 + y)) = 0
(-20 + -4y + (5 * x + y * x)) = 0
(-20 + -4y + (5x + xy)) = 0

Reorder the terms:
(-20 + 5x + xy + -4y) = 0
(-20 + 5x + xy + -4y) = 0

Solving
-20 + 5x + xy + -4y = 0

Solving for variable 'x'.

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

Add '20' to each side of the equation.
-20 + 5x + xy + 20 + -4y = 0 + 20

Reorder the terms:
-20 + 20 + 5x + xy + -4y = 0 + 20

Combine like terms: -20 + 20 = 0
0 + 5x + xy + -4y = 0 + 20
5x + xy + -4y = 0 + 20

Combine like terms: 0 + 20 = 20
5x + xy + -4y = 20

Add '4y' to each side of the equation.
5x + xy + -4y + 4y = 20 + 4y

Combine like terms: -4y + 4y = 0
5x + xy + 0 = 20 + 4y
5x + xy = 20 + 4y

Reorder the terms:
-20 + 5x + xy + -4y = 20 + 4y + -20 + -4y

Reorder the terms:
-20 + 5x + xy + -4y = 20 + -20 + 4y + -4y

Combine like terms: 20 + -20 = 0
-20 + 5x + xy + -4y = 0 + 4y + -4y
-20 + 5x + xy + -4y = 4y + -4y

Combine like terms: 4y + -4y = 0
-20 + 5x + xy + -4y = 0

The solution to this equation could not be determined.

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