(x+4)(x-6)+21=0

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Solution for (x+4)(x-6)+21=0 equation:


Simplifying
(x + 4)(x + -6) + 21 = 0

Reorder the terms:
(4 + x)(x + -6) + 21 = 0

Reorder the terms:
(4 + x)(-6 + x) + 21 = 0

Multiply (4 + x) * (-6 + x)
(4(-6 + x) + x(-6 + x)) + 21 = 0
((-6 * 4 + x * 4) + x(-6 + x)) + 21 = 0
((-24 + 4x) + x(-6 + x)) + 21 = 0
(-24 + 4x + (-6 * x + x * x)) + 21 = 0
(-24 + 4x + (-6x + x2)) + 21 = 0

Combine like terms: 4x + -6x = -2x
(-24 + -2x + x2) + 21 = 0

Reorder the terms:
-24 + 21 + -2x + x2 = 0

Combine like terms: -24 + 21 = -3
-3 + -2x + x2 = 0

Solving
-3 + -2x + x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(-1 + -1x)(3 + -1x) = 0

Subproblem 1

Set the factor '(-1 + -1x)' equal to zero and attempt to solve: Simplifying -1 + -1x = 0 Solving -1 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + -1x = 0 + 1 Combine like terms: -1 + 1 = 0 0 + -1x = 0 + 1 -1x = 0 + 1 Combine like terms: 0 + 1 = 1 -1x = 1 Divide each side by '-1'. x = -1 Simplifying x = -1

Subproblem 2

Set the factor '(3 + -1x)' equal to zero and attempt to solve: Simplifying 3 + -1x = 0 Solving 3 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -1x = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -1x = 0 + -3 -1x = 0 + -3 Combine like terms: 0 + -3 = -3 -1x = -3 Divide each side by '-1'. x = 3 Simplifying x = 3

Solution

x = {-1, 3}

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