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

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


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

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

Reorder the terms:
2x + x2 = 3(-5 + x)
2x + x2 = (-5 * 3 + x * 3)
2x + x2 = (-15 + 3x)

Solving
2x + x2 = -15 + 3x

Solving for variable 'x'.

Reorder the terms:
15 + 2x + -3x + x2 = -15 + 3x + 15 + -3x

Combine like terms: 2x + -3x = -1x
15 + -1x + x2 = -15 + 3x + 15 + -3x

Reorder the terms:
15 + -1x + x2 = -15 + 15 + 3x + -3x

Combine like terms: -15 + 15 = 0
15 + -1x + x2 = 0 + 3x + -3x
15 + -1x + x2 = 3x + -3x

Combine like terms: 3x + -3x = 0
15 + -1x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-15' to each side of the equation.
15 + -1x + -15 + x2 = 0 + -15

Reorder the terms:
15 + -15 + -1x + x2 = 0 + -15

Combine like terms: 15 + -15 = 0
0 + -1x + x2 = 0 + -15
-1x + x2 = 0 + -15

Combine like terms: 0 + -15 = -15
-1x + x2 = -15

The x term is -1x.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1x + 0.25 + x2 = -15 + 0.25

Reorder the terms:
0.25 + -1x + x2 = -15 + 0.25

Combine like terms: -15 + 0.25 = -14.75
0.25 + -1x + x2 = -14.75

Factor a perfect square on the left side:
(x + -0.5)(x + -0.5) = -14.75

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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