(x+1)(x-2)-x^2=9

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Solution for (x+1)(x-2)-x^2=9 equation:


Simplifying
(x + 1)(x + -2) + -1x2 = 9

Reorder the terms:
(1 + x)(x + -2) + -1x2 = 9

Reorder the terms:
(1 + x)(-2 + x) + -1x2 = 9

Multiply (1 + x) * (-2 + x)
(1(-2 + x) + x(-2 + x)) + -1x2 = 9
((-2 * 1 + x * 1) + x(-2 + x)) + -1x2 = 9
((-2 + 1x) + x(-2 + x)) + -1x2 = 9
(-2 + 1x + (-2 * x + x * x)) + -1x2 = 9
(-2 + 1x + (-2x + x2)) + -1x2 = 9

Combine like terms: 1x + -2x = -1x
(-2 + -1x + x2) + -1x2 = 9

Combine like terms: x2 + -1x2 = 0
-2 + -1x + 0 = 9
-2 + -1x = 9

Solving
-2 + -1x = 9

Solving for variable 'x'.

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

Add '2' to each side of the equation.
-2 + 2 + -1x = 9 + 2

Combine like terms: -2 + 2 = 0
0 + -1x = 9 + 2
-1x = 9 + 2

Combine like terms: 9 + 2 = 11
-1x = 11

Divide each side by '-1'.
x = -11

Simplifying
x = -11

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