(3-x)(7x-28)=0

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Solution for (3-x)(7x-28)=0 equation:


Simplifying
(3 + -1x)(7x + -28) = 0

Reorder the terms:
(3 + -1x)(-28 + 7x) = 0

Multiply (3 + -1x) * (-28 + 7x)
(3(-28 + 7x) + -1x * (-28 + 7x)) = 0
((-28 * 3 + 7x * 3) + -1x * (-28 + 7x)) = 0
((-84 + 21x) + -1x * (-28 + 7x)) = 0
(-84 + 21x + (-28 * -1x + 7x * -1x)) = 0
(-84 + 21x + (28x + -7x2)) = 0

Combine like terms: 21x + 28x = 49x
(-84 + 49x + -7x2) = 0

Solving
-84 + 49x + -7x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '7'.
7(-12 + 7x + -1x2) = 0

Factor a trinomial.
7((-4 + x)(3 + -1x)) = 0

Ignore the factor 7.

Subproblem 1

Set the factor '(-4 + x)' equal to zero and attempt to solve: Simplifying -4 + x = 0 Solving -4 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = 0 + 4 Combine like terms: -4 + 4 = 0 0 + x = 0 + 4 x = 0 + 4 Combine like terms: 0 + 4 = 4 x = 4 Simplifying x = 4

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 = {4, 3}

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