(x+a)(x-b)-x(x+a)=0

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Solution for (x+a)(x-b)-x(x+a)=0 equation:


Simplifying
(x + a)(x + -1b) + -1x(x + a) = 0

Reorder the terms:
(a + x)(x + -1b) + -1x(x + a) = 0

Reorder the terms:
(a + x)(-1b + x) + -1x(x + a) = 0

Multiply (a + x) * (-1b + x)
(a(-1b + x) + x(-1b + x)) + -1x(x + a) = 0
((-1b * a + x * a) + x(-1b + x)) + -1x(x + a) = 0
((-1ab + ax) + x(-1b + x)) + -1x(x + a) = 0
(-1ab + ax + (-1b * x + x * x)) + -1x(x + a) = 0
(-1ab + ax + (-1bx + x2)) + -1x(x + a) = 0
(-1ab + ax + -1bx + x2) + -1x(x + a) = 0

Reorder the terms:
-1ab + ax + -1bx + x2 + -1x(a + x) = 0
-1ab + ax + -1bx + x2 + (a * -1x + x * -1x) = 0
-1ab + ax + -1bx + x2 + (-1ax + -1x2) = 0

Reorder the terms:
-1ab + ax + -1ax + -1bx + x2 + -1x2 = 0

Combine like terms: ax + -1ax = 0
-1ab + 0 + -1bx + x2 + -1x2 = 0
-1ab + -1bx + x2 + -1x2 = 0

Combine like terms: x2 + -1x2 = 0
-1ab + -1bx + 0 = 0
-1ab + -1bx = 0

Solving
-1ab + -1bx = 0

Solving for variable 'a'.

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

Add 'bx' to each side of the equation.
-1ab + -1bx + bx = 0 + bx

Combine like terms: -1bx + bx = 0
-1ab + 0 = 0 + bx
-1ab = 0 + bx
Remove the zero:
-1ab = bx

Divide each side by '-1b'.
a = -1x

Simplifying
a = -1x

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