0=5x^2+31x+42

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Solution for 0=5x^2+31x+42 equation:


Simplifying
0 = 5x2 + 31x + 42

Reorder the terms:
0 = 42 + 31x + 5x2

Solving
0 = 42 + 31x + 5x2

Solving for variable 'x'.

Combine like terms: 0 + -42 = -42
-42 + -31x + -5x2 = 42 + 31x + 5x2 + -42 + -31x + -5x2

Reorder the terms:
-42 + -31x + -5x2 = 42 + -42 + 31x + -31x + 5x2 + -5x2

Combine like terms: 42 + -42 = 0
-42 + -31x + -5x2 = 0 + 31x + -31x + 5x2 + -5x2
-42 + -31x + -5x2 = 31x + -31x + 5x2 + -5x2

Combine like terms: 31x + -31x = 0
-42 + -31x + -5x2 = 0 + 5x2 + -5x2
-42 + -31x + -5x2 = 5x2 + -5x2

Combine like terms: 5x2 + -5x2 = 0
-42 + -31x + -5x2 = 0

Factor out the Greatest Common Factor (GCF), '-1'.
-1(42 + 31x + 5x2) = 0

Factor a trinomial.
-1((21 + 5x)(2 + x)) = 0

Ignore the factor -1.

Subproblem 1

Set the factor '(21 + 5x)' equal to zero and attempt to solve: Simplifying 21 + 5x = 0 Solving 21 + 5x = 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 + 5x = 0 + -21 Combine like terms: 21 + -21 = 0 0 + 5x = 0 + -21 5x = 0 + -21 Combine like terms: 0 + -21 = -21 5x = -21 Divide each side by '5'. x = -4.2 Simplifying x = -4.2

Subproblem 2

Set the factor '(2 + x)' equal to zero and attempt to solve: Simplifying 2 + x = 0 Solving 2 + x = 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 + x = 0 + -2 Combine like terms: 2 + -2 = 0 0 + x = 0 + -2 x = 0 + -2 Combine like terms: 0 + -2 = -2 x = -2 Simplifying x = -2

Solution

x = {-4.2, -2}

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