3x^2+15x=42

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Solution for 3x^2+15x=42 equation:


Simplifying
3x2 + 15x = 42

Reorder the terms:
15x + 3x2 = 42

Solving
15x + 3x2 = 42

Solving for variable 'x'.

Reorder the terms:
-42 + 15x + 3x2 = 42 + -42

Combine like terms: 42 + -42 = 0
-42 + 15x + 3x2 = 0

Factor out the Greatest Common Factor (GCF), '3'.
3(-14 + 5x + x2) = 0

Factor a trinomial.
3((-7 + -1x)(2 + -1x)) = 0

Ignore the factor 3.

Subproblem 1

Set the factor '(-7 + -1x)' equal to zero and attempt to solve: Simplifying -7 + -1x = 0 Solving -7 + -1x = 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 + -1x = 0 + 7 Combine like terms: -7 + 7 = 0 0 + -1x = 0 + 7 -1x = 0 + 7 Combine like terms: 0 + 7 = 7 -1x = 7 Divide each side by '-1'. x = -7 Simplifying x = -7

Subproblem 2

Set the factor '(2 + -1x)' equal to zero and attempt to solve: Simplifying 2 + -1x = 0 Solving 2 + -1x = 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 + -1x = 0 + -2 Combine like terms: 2 + -2 = 0 0 + -1x = 0 + -2 -1x = 0 + -2 Combine like terms: 0 + -2 = -2 -1x = -2 Divide each side by '-1'. x = 2 Simplifying x = 2

Solution

x = {-7, 2}

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