7x^2-6x-15x=28

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Solution for 7x^2-6x-15x=28 equation:


Simplifying
7x2 + -6x + -15x = 28

Reorder the terms:
-6x + -15x + 7x2 = 28

Combine like terms: -6x + -15x = -21x
-21x + 7x2 = 28

Solving
-21x + 7x2 = 28

Solving for variable 'x'.

Reorder the terms:
-28 + -21x + 7x2 = 28 + -28

Combine like terms: 28 + -28 = 0
-28 + -21x + 7x2 = 0

Factor out the Greatest Common Factor (GCF), '7'.
7(-4 + -3x + x2) = 0

Factor a trinomial.
7((-1 + -1x)(4 + -1x)) = 0

Ignore the factor 7.

Subproblem 1

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

Subproblem 2

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

Solution

x = {-1, 4}

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