(4x+3)(x-3)=20x+15

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Solution for (4x+3)(x-3)=20x+15 equation:


Simplifying
(4x + 3)(x + -3) = 20x + 15

Reorder the terms:
(3 + 4x)(x + -3) = 20x + 15

Reorder the terms:
(3 + 4x)(-3 + x) = 20x + 15

Multiply (3 + 4x) * (-3 + x)
(3(-3 + x) + 4x * (-3 + x)) = 20x + 15
((-3 * 3 + x * 3) + 4x * (-3 + x)) = 20x + 15
((-9 + 3x) + 4x * (-3 + x)) = 20x + 15
(-9 + 3x + (-3 * 4x + x * 4x)) = 20x + 15
(-9 + 3x + (-12x + 4x2)) = 20x + 15

Combine like terms: 3x + -12x = -9x
(-9 + -9x + 4x2) = 20x + 15

Reorder the terms:
-9 + -9x + 4x2 = 15 + 20x

Solving
-9 + -9x + 4x2 = 15 + 20x

Solving for variable 'x'.

Reorder the terms:
-9 + -15 + -9x + -20x + 4x2 = 15 + 20x + -15 + -20x

Combine like terms: -9 + -15 = -24
-24 + -9x + -20x + 4x2 = 15 + 20x + -15 + -20x

Combine like terms: -9x + -20x = -29x
-24 + -29x + 4x2 = 15 + 20x + -15 + -20x

Reorder the terms:
-24 + -29x + 4x2 = 15 + -15 + 20x + -20x

Combine like terms: 15 + -15 = 0
-24 + -29x + 4x2 = 0 + 20x + -20x
-24 + -29x + 4x2 = 20x + -20x

Combine like terms: 20x + -20x = 0
-24 + -29x + 4x2 = 0

Factor a trinomial.
(-3 + -4x)(8 + -1x) = 0

Subproblem 1

Set the factor '(-3 + -4x)' equal to zero and attempt to solve: Simplifying -3 + -4x = 0 Solving -3 + -4x = 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 + -4x = 0 + 3 Combine like terms: -3 + 3 = 0 0 + -4x = 0 + 3 -4x = 0 + 3 Combine like terms: 0 + 3 = 3 -4x = 3 Divide each side by '-4'. x = -0.75 Simplifying x = -0.75

Subproblem 2

Set the factor '(8 + -1x)' equal to zero and attempt to solve: Simplifying 8 + -1x = 0 Solving 8 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + -1x = 0 + -8 Combine like terms: 8 + -8 = 0 0 + -1x = 0 + -8 -1x = 0 + -8 Combine like terms: 0 + -8 = -8 -1x = -8 Divide each side by '-1'. x = 8 Simplifying x = 8

Solution

x = {-0.75, 8}

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