(8x+3)(5x-15)=0

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Solution for (8x+3)(5x-15)=0 equation:


Simplifying
(8x + 3)(5x + -15) = 0

Reorder the terms:
(3 + 8x)(5x + -15) = 0

Reorder the terms:
(3 + 8x)(-15 + 5x) = 0

Multiply (3 + 8x) * (-15 + 5x)
(3(-15 + 5x) + 8x * (-15 + 5x)) = 0
((-15 * 3 + 5x * 3) + 8x * (-15 + 5x)) = 0
((-45 + 15x) + 8x * (-15 + 5x)) = 0
(-45 + 15x + (-15 * 8x + 5x * 8x)) = 0
(-45 + 15x + (-120x + 40x2)) = 0

Combine like terms: 15x + -120x = -105x
(-45 + -105x + 40x2) = 0

Solving
-45 + -105x + 40x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '5'.
5(-9 + -21x + 8x2) = 0

Factor a trinomial.
5((-3 + -8x)(3 + -1x)) = 0

Ignore the factor 5.

Subproblem 1

Set the factor '(-3 + -8x)' equal to zero and attempt to solve: Simplifying -3 + -8x = 0 Solving -3 + -8x = 0 Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + -8x = 0 + 3 Combine like terms: -3 + 3 = 0 0 + -8x = 0 + 3 -8x = 0 + 3 Combine like terms: 0 + 3 = 3 -8x = 3 Divide each side by '-8'. x = -0.375 Simplifying x = -0.375

Subproblem 2

Set the factor '(3 + -1x)' equal to zero and attempt to solve: Simplifying 3 + -1x = 0 Solving 3 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -1x = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -1x = 0 + -3 -1x = 0 + -3 Combine like terms: 0 + -3 = -3 -1x = -3 Divide each side by '-1'. x = 3 Simplifying x = 3

Solution

x = {-0.375, 3}

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