3x^2+16x=-21

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Solution for 3x^2+16x=-21 equation:


Simplifying
3x2 + 16x = -21

Reorder the terms:
16x + 3x2 = -21

Solving
16x + 3x2 = -21

Solving for variable 'x'.

Reorder the terms:
21 + 16x + 3x2 = -21 + 21

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

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

Subproblem 1

Set the factor '(3 + x)' equal to zero and attempt to solve: Simplifying 3 + x = 0 Solving 3 + x = 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 + x = 0 + -3 Combine like terms: 3 + -3 = 0 0 + x = 0 + -3 x = 0 + -3 Combine like terms: 0 + -3 = -3 x = -3 Simplifying x = -3

Subproblem 2

Set the factor '(7 + 3x)' equal to zero and attempt to solve: Simplifying 7 + 3x = 0 Solving 7 + 3x = 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 + 3x = 0 + -7 Combine like terms: 7 + -7 = 0 0 + 3x = 0 + -7 3x = 0 + -7 Combine like terms: 0 + -7 = -7 3x = -7 Divide each side by '3'. x = -2.333333333 Simplifying x = -2.333333333

Solution

x = {-3, -2.333333333}

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