3x^2-4x-21x+28=0

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Solution for 3x^2-4x-21x+28=0 equation:


Simplifying
3x2 + -4x + -21x + 28 = 0

Reorder the terms:
28 + -4x + -21x + 3x2 = 0

Combine like terms: -4x + -21x = -25x
28 + -25x + 3x2 = 0

Solving
28 + -25x + 3x2 = 0

Solving for variable 'x'.

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

Subproblem 1

Set the factor '(4 + -3x)' equal to zero and attempt to solve: Simplifying 4 + -3x = 0 Solving 4 + -3x = 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 + -3x = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -3x = 0 + -4 -3x = 0 + -4 Combine like terms: 0 + -4 = -4 -3x = -4 Divide each side by '-3'. x = 1.333333333 Simplifying x = 1.333333333

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 = {1.333333333, 7}

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