4x(x+3)=(2x-5)(2x+1)

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Solution for 4x(x+3)=(2x-5)(2x+1) equation:


Simplifying
4x(x + 3) = (2x + -5)(2x + 1)

Reorder the terms:
4x(3 + x) = (2x + -5)(2x + 1)
(3 * 4x + x * 4x) = (2x + -5)(2x + 1)
(12x + 4x2) = (2x + -5)(2x + 1)

Reorder the terms:
12x + 4x2 = (-5 + 2x)(2x + 1)

Reorder the terms:
12x + 4x2 = (-5 + 2x)(1 + 2x)

Multiply (-5 + 2x) * (1 + 2x)
12x + 4x2 = (-5(1 + 2x) + 2x * (1 + 2x))
12x + 4x2 = ((1 * -5 + 2x * -5) + 2x * (1 + 2x))
12x + 4x2 = ((-5 + -10x) + 2x * (1 + 2x))
12x + 4x2 = (-5 + -10x + (1 * 2x + 2x * 2x))
12x + 4x2 = (-5 + -10x + (2x + 4x2))

Combine like terms: -10x + 2x = -8x
12x + 4x2 = (-5 + -8x + 4x2)

Add '-4x2' to each side of the equation.
12x + 4x2 + -4x2 = -5 + -8x + 4x2 + -4x2

Combine like terms: 4x2 + -4x2 = 0
12x + 0 = -5 + -8x + 4x2 + -4x2
12x = -5 + -8x + 4x2 + -4x2

Combine like terms: 4x2 + -4x2 = 0
12x = -5 + -8x + 0
12x = -5 + -8x

Solving
12x = -5 + -8x

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '8x' to each side of the equation.
12x + 8x = -5 + -8x + 8x

Combine like terms: 12x + 8x = 20x
20x = -5 + -8x + 8x

Combine like terms: -8x + 8x = 0
20x = -5 + 0
20x = -5

Divide each side by '20'.
x = -0.25

Simplifying
x = -0.25

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