-15x+42=3x^2

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


Simplifying
-15x + 42 = 3x2

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

Solving
42 + -15x = 3x2

Solving for variable 'x'.

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

Factor out the Greatest Common Factor (GCF), '3'.
3(14 + -5x + -1x2) = 0

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

Ignore the factor 3.

Subproblem 1

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

Subproblem 2

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

Solution

x = {2, -7}

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