3x^2+11x-21=-1

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Solution for 3x^2+11x-21=-1 equation:


Simplifying
3x2 + 11x + -21 = -1

Reorder the terms:
-21 + 11x + 3x2 = -1

Solving
-21 + 11x + 3x2 = -1

Solving for variable 'x'.

Reorder the terms:
-21 + 1 + 11x + 3x2 = -1 + 1

Combine like terms: -21 + 1 = -20
-20 + 11x + 3x2 = -1 + 1

Combine like terms: -1 + 1 = 0
-20 + 11x + 3x2 = 0

Factor a trinomial.
(-5 + -1x)(4 + -3x) = 0

Subproblem 1

Set the factor '(-5 + -1x)' equal to zero and attempt to solve: Simplifying -5 + -1x = 0 Solving -5 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + -1x = 0 + 5 Combine like terms: -5 + 5 = 0 0 + -1x = 0 + 5 -1x = 0 + 5 Combine like terms: 0 + 5 = 5 -1x = 5 Divide each side by '-1'. x = -5 Simplifying x = -5

Subproblem 2

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

Solution

x = {-5, 1.333333333}

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