5x(x-2)+3(2x+6)=

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Solution for 5x(x-2)+3(2x+6)= equation:


Simplifying
5x(x + -2) + 3(2x + 6) = 0

Reorder the terms:
5x(-2 + x) + 3(2x + 6) = 0
(-2 * 5x + x * 5x) + 3(2x + 6) = 0
(-10x + 5x2) + 3(2x + 6) = 0

Reorder the terms:
-10x + 5x2 + 3(6 + 2x) = 0
-10x + 5x2 + (6 * 3 + 2x * 3) = 0
-10x + 5x2 + (18 + 6x) = 0

Reorder the terms:
18 + -10x + 6x + 5x2 = 0

Combine like terms: -10x + 6x = -4x
18 + -4x + 5x2 = 0

Solving
18 + -4x + 5x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
5 the coefficient of the squared term: 

Divide each side by '5'.
3.6 + -0.8x + x2 = 0

Move the constant term to the right:

Add '-3.6' to each side of the equation.
3.6 + -0.8x + -3.6 + x2 = 0 + -3.6

Reorder the terms:
3.6 + -3.6 + -0.8x + x2 = 0 + -3.6

Combine like terms: 3.6 + -3.6 = 0.0
0.0 + -0.8x + x2 = 0 + -3.6
-0.8x + x2 = 0 + -3.6

Combine like terms: 0 + -3.6 = -3.6
-0.8x + x2 = -3.6

The x term is -0.8x.  Take half its coefficient (-0.4).
Square it (0.16) and add it to both sides.

Add '0.16' to each side of the equation.
-0.8x + 0.16 + x2 = -3.6 + 0.16

Reorder the terms:
0.16 + -0.8x + x2 = -3.6 + 0.16

Combine like terms: -3.6 + 0.16 = -3.44
0.16 + -0.8x + x2 = -3.44

Factor a perfect square on the left side:
(x + -0.4)(x + -0.4) = -3.44

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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