(7x-3)(3x+9)=0

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Solution for (7x-3)(3x+9)=0 equation:


Simplifying
(7x + -3)(3x + 9) = 0

Reorder the terms:
(-3 + 7x)(3x + 9) = 0

Reorder the terms:
(-3 + 7x)(9 + 3x) = 0

Multiply (-3 + 7x) * (9 + 3x)
(-3(9 + 3x) + 7x * (9 + 3x)) = 0
((9 * -3 + 3x * -3) + 7x * (9 + 3x)) = 0
((-27 + -9x) + 7x * (9 + 3x)) = 0
(-27 + -9x + (9 * 7x + 3x * 7x)) = 0
(-27 + -9x + (63x + 21x2)) = 0

Combine like terms: -9x + 63x = 54x
(-27 + 54x + 21x2) = 0

Solving
-27 + 54x + 21x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '3'.
3(-9 + 18x + 7x2) = 0

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

Ignore the factor 3.

Subproblem 1

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

Subproblem 2

Set the factor '(3 + -7x)' equal to zero and attempt to solve: Simplifying 3 + -7x = 0 Solving 3 + -7x = 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 + -7x = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -7x = 0 + -3 -7x = 0 + -3 Combine like terms: 0 + -3 = -3 -7x = -3 Divide each side by '-7'. x = 0.4285714286 Simplifying x = 0.4285714286

Solution

x = {-3, 0.4285714286}

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