-6x-15=4x^2+20x+25

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Solution for -6x-15=4x^2+20x+25 equation:


Simplifying
-6x + -15 = 4x2 + 20x + 25

Reorder the terms:
-15 + -6x = 4x2 + 20x + 25

Reorder the terms:
-15 + -6x = 25 + 20x + 4x2

Solving
-15 + -6x = 25 + 20x + 4x2

Solving for variable 'x'.

Reorder the terms:
-15 + -25 + -6x + -20x + -4x2 = 25 + 20x + 4x2 + -25 + -20x + -4x2

Combine like terms: -15 + -25 = -40
-40 + -6x + -20x + -4x2 = 25 + 20x + 4x2 + -25 + -20x + -4x2

Combine like terms: -6x + -20x = -26x
-40 + -26x + -4x2 = 25 + 20x + 4x2 + -25 + -20x + -4x2

Reorder the terms:
-40 + -26x + -4x2 = 25 + -25 + 20x + -20x + 4x2 + -4x2

Combine like terms: 25 + -25 = 0
-40 + -26x + -4x2 = 0 + 20x + -20x + 4x2 + -4x2
-40 + -26x + -4x2 = 20x + -20x + 4x2 + -4x2

Combine like terms: 20x + -20x = 0
-40 + -26x + -4x2 = 0 + 4x2 + -4x2
-40 + -26x + -4x2 = 4x2 + -4x2

Combine like terms: 4x2 + -4x2 = 0
-40 + -26x + -4x2 = 0

Factor out the Greatest Common Factor (GCF), '-2'.
-2(20 + 13x + 2x2) = 0

Factor a trinomial.
-2((4 + x)(5 + 2x)) = 0

Ignore the factor -2.

Subproblem 1

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

Subproblem 2

Set the factor '(5 + 2x)' equal to zero and attempt to solve: Simplifying 5 + 2x = 0 Solving 5 + 2x = 0 Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + 2x = 0 + -5 Combine like terms: 5 + -5 = 0 0 + 2x = 0 + -5 2x = 0 + -5 Combine like terms: 0 + -5 = -5 2x = -5 Divide each side by '2'. x = -2.5 Simplifying x = -2.5

Solution

x = {-4, -2.5}

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