3x(x+5)+2x^2=8x-11

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Solution for 3x(x+5)+2x^2=8x-11 equation:


Simplifying
3x(x + 5) + 2x2 = 8x + -11

Reorder the terms:
3x(5 + x) + 2x2 = 8x + -11
(5 * 3x + x * 3x) + 2x2 = 8x + -11
(15x + 3x2) + 2x2 = 8x + -11

Combine like terms: 3x2 + 2x2 = 5x2
15x + 5x2 = 8x + -11

Reorder the terms:
15x + 5x2 = -11 + 8x

Solving
15x + 5x2 = -11 + 8x

Solving for variable 'x'.

Reorder the terms:
11 + 15x + -8x + 5x2 = -11 + 8x + 11 + -8x

Combine like terms: 15x + -8x = 7x
11 + 7x + 5x2 = -11 + 8x + 11 + -8x

Reorder the terms:
11 + 7x + 5x2 = -11 + 11 + 8x + -8x

Combine like terms: -11 + 11 = 0
11 + 7x + 5x2 = 0 + 8x + -8x
11 + 7x + 5x2 = 8x + -8x

Combine like terms: 8x + -8x = 0
11 + 7x + 5x2 = 0

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

Divide each side by '5'.
2.2 + 1.4x + x2 = 0

Move the constant term to the right:

Add '-2.2' to each side of the equation.
2.2 + 1.4x + -2.2 + x2 = 0 + -2.2

Reorder the terms:
2.2 + -2.2 + 1.4x + x2 = 0 + -2.2

Combine like terms: 2.2 + -2.2 = 0.0
0.0 + 1.4x + x2 = 0 + -2.2
1.4x + x2 = 0 + -2.2

Combine like terms: 0 + -2.2 = -2.2
1.4x + x2 = -2.2

The x term is 1.4x.  Take half its coefficient (0.7).
Square it (0.49) and add it to both sides.

Add '0.49' to each side of the equation.
1.4x + 0.49 + x2 = -2.2 + 0.49

Reorder the terms:
0.49 + 1.4x + x2 = -2.2 + 0.49

Combine like terms: -2.2 + 0.49 = -1.71
0.49 + 1.4x + x2 = -1.71

Factor a perfect square on the left side:
(x + 0.7)(x + 0.7) = -1.71

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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