(3x-21)(x+1)=0

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Solution for (3x-21)(x+1)=0 equation:


Simplifying
(3x + -21)(x + 1) = 0

Reorder the terms:
(-21 + 3x)(x + 1) = 0

Reorder the terms:
(-21 + 3x)(1 + x) = 0

Multiply (-21 + 3x) * (1 + x)
(-21(1 + x) + 3x * (1 + x)) = 0
((1 * -21 + x * -21) + 3x * (1 + x)) = 0
((-21 + -21x) + 3x * (1 + x)) = 0
(-21 + -21x + (1 * 3x + x * 3x)) = 0
(-21 + -21x + (3x + 3x2)) = 0

Combine like terms: -21x + 3x = -18x
(-21 + -18x + 3x2) = 0

Solving
-21 + -18x + 3x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '3'.
3(-7 + -6x + x2) = 0

Factor a trinomial.
3((-1 + -1x)(7 + -1x)) = 0

Ignore the factor 3.

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 '(7 + -1x)' equal to zero and attempt to solve: Simplifying 7 + -1x = 0 Solving 7 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -1x = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -1x = 0 + -7 -1x = 0 + -7 Combine like terms: 0 + -7 = -7 -1x = -7 Divide each side by '-1'. x = 7 Simplifying x = 7

Solution

x = {-1, 7}

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