840=11x+3x^2

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Solution for 840=11x+3x^2 equation:


Simplifying
840 = 11x + 3x2

Solving
840 = 11x + 3x2

Solving for variable 'x'.

Reorder the terms:
840 + -11x + -3x2 = 11x + -11x + 3x2 + -3x2

Combine like terms: 11x + -11x = 0
840 + -11x + -3x2 = 0 + 3x2 + -3x2
840 + -11x + -3x2 = 3x2 + -3x2

Combine like terms: 3x2 + -3x2 = 0
840 + -11x + -3x2 = 0

Factor a trinomial.
(15 + -1x)(56 + 3x) = 0

Subproblem 1

Set the factor '(15 + -1x)' equal to zero and attempt to solve: Simplifying 15 + -1x = 0 Solving 15 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + -1x = 0 + -15 Combine like terms: 15 + -15 = 0 0 + -1x = 0 + -15 -1x = 0 + -15 Combine like terms: 0 + -15 = -15 -1x = -15 Divide each side by '-1'. x = 15 Simplifying x = 15

Subproblem 2

Set the factor '(56 + 3x)' equal to zero and attempt to solve: Simplifying 56 + 3x = 0 Solving 56 + 3x = 0 Move all terms containing x to the left, all other terms to the right. Add '-56' to each side of the equation. 56 + -56 + 3x = 0 + -56 Combine like terms: 56 + -56 = 0 0 + 3x = 0 + -56 3x = 0 + -56 Combine like terms: 0 + -56 = -56 3x = -56 Divide each side by '3'. x = -18.66666667 Simplifying x = -18.66666667

Solution

x = {15, -18.66666667}

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