0=4x^2+5x-84

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Solution for 0=4x^2+5x-84 equation:


Simplifying
0 = 4x2 + 5x + -84

Reorder the terms:
0 = -84 + 5x + 4x2

Solving
0 = -84 + 5x + 4x2

Solving for variable 'x'.

Combine like terms: 0 + 84 = 84
84 + -5x + -4x2 = -84 + 5x + 4x2 + 84 + -5x + -4x2

Reorder the terms:
84 + -5x + -4x2 = -84 + 84 + 5x + -5x + 4x2 + -4x2

Combine like terms: -84 + 84 = 0
84 + -5x + -4x2 = 0 + 5x + -5x + 4x2 + -4x2
84 + -5x + -4x2 = 5x + -5x + 4x2 + -4x2

Combine like terms: 5x + -5x = 0
84 + -5x + -4x2 = 0 + 4x2 + -4x2
84 + -5x + -4x2 = 4x2 + -4x2

Combine like terms: 4x2 + -4x2 = 0
84 + -5x + -4x2 = 0

Factor a trinomial.
(4 + -1x)(21 + 4x) = 0

Subproblem 1

Set the factor '(4 + -1x)' equal to zero and attempt to solve: Simplifying 4 + -1x = 0 Solving 4 + -1x = 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 + -1x = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -1x = 0 + -4 -1x = 0 + -4 Combine like terms: 0 + -4 = -4 -1x = -4 Divide each side by '-1'. x = 4 Simplifying x = 4

Subproblem 2

Set the factor '(21 + 4x)' equal to zero and attempt to solve: Simplifying 21 + 4x = 0 Solving 21 + 4x = 0 Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 4x = 0 + -21 Combine like terms: 21 + -21 = 0 0 + 4x = 0 + -21 4x = 0 + -21 Combine like terms: 0 + -21 = -21 4x = -21 Divide each side by '4'. x = -5.25 Simplifying x = -5.25

Solution

x = {4, -5.25}

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