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

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


Simplifying
5x(x + 3) + -4(2x + -1) = 0

Reorder the terms:
5x(3 + x) + -4(2x + -1) = 0
(3 * 5x + x * 5x) + -4(2x + -1) = 0
(15x + 5x2) + -4(2x + -1) = 0

Reorder the terms:
15x + 5x2 + -4(-1 + 2x) = 0
15x + 5x2 + (-1 * -4 + 2x * -4) = 0
15x + 5x2 + (4 + -8x) = 0

Reorder the terms:
4 + 15x + -8x + 5x2 = 0

Combine like terms: 15x + -8x = 7x
4 + 7x + 5x2 = 0

Solving
4 + 7x + 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'.
0.8 + 1.4x + x2 = 0

Move the constant term to the right:

Add '-0.8' to each side of the equation.
0.8 + 1.4x + -0.8 + x2 = 0 + -0.8

Reorder the terms:
0.8 + -0.8 + 1.4x + x2 = 0 + -0.8

Combine like terms: 0.8 + -0.8 = 0.0
0.0 + 1.4x + x2 = 0 + -0.8
1.4x + x2 = 0 + -0.8

Combine like terms: 0 + -0.8 = -0.8
1.4x + x2 = -0.8

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 = -0.8 + 0.49

Reorder the terms:
0.49 + 1.4x + x2 = -0.8 + 0.49

Combine like terms: -0.8 + 0.49 = -0.31
0.49 + 1.4x + x2 = -0.31

Factor a perfect square on the left side:
(x + 0.7)(x + 0.7) = -0.31

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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