3x^2-2x+5=21

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Solution for 3x^2-2x+5=21 equation:


Simplifying
3x2 + -2x + 5 = 21

Reorder the terms:
5 + -2x + 3x2 = 21

Solving
5 + -2x + 3x2 = 21

Solving for variable 'x'.

Reorder the terms:
5 + -21 + -2x + 3x2 = 21 + -21

Combine like terms: 5 + -21 = -16
-16 + -2x + 3x2 = 21 + -21

Combine like terms: 21 + -21 = 0
-16 + -2x + 3x2 = 0

Factor a trinomial.
(-2 + -1x)(8 + -3x) = 0

Subproblem 1

Set the factor '(-2 + -1x)' equal to zero and attempt to solve: Simplifying -2 + -1x = 0 Solving -2 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + -1x = 0 + 2 Combine like terms: -2 + 2 = 0 0 + -1x = 0 + 2 -1x = 0 + 2 Combine like terms: 0 + 2 = 2 -1x = 2 Divide each side by '-1'. x = -2 Simplifying x = -2

Subproblem 2

Set the factor '(8 + -3x)' equal to zero and attempt to solve: Simplifying 8 + -3x = 0 Solving 8 + -3x = 0 Move all terms containing x to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + -3x = 0 + -8 Combine like terms: 8 + -8 = 0 0 + -3x = 0 + -8 -3x = 0 + -8 Combine like terms: 0 + -8 = -8 -3x = -8 Divide each side by '-3'. x = 2.666666667 Simplifying x = 2.666666667

Solution

x = {-2, 2.666666667}

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